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Security Tight as M.I.T. Officer Is Mourned Security Tight as M.I.T. Officer Is Mourned
(about 2 hours later)
CAMBRIDGE, Mass. — Police officers from across the country and other mourners turned out by the thousands Wednesday afternoon for a somber public memorial service at the Massachusetts Institute of Technology to honor a campus officer who the authorities say was killed by two brothers who are also suspected of detonating two bombs near the finish line of the Boston Marathon last week.CAMBRIDGE, Mass. — Police officers from across the country and other mourners turned out by the thousands Wednesday afternoon for a somber public memorial service at the Massachusetts Institute of Technology to honor a campus officer who the authorities say was killed by two brothers who are also suspected of detonating two bombs near the finish line of the Boston Marathon last week.
Dozens of metal detectors were set up at the entrance to Briggs Field on the M.I.T. campus and the authorities shut down sections of Cambridge, including the Massachusetts Avenue Bridge, which connects Cambridge to Boston, and part of Memorial Drive, a major riverside thoroughfare.Dozens of metal detectors were set up at the entrance to Briggs Field on the M.I.T. campus and the authorities shut down sections of Cambridge, including the Massachusetts Avenue Bridge, which connects Cambridge to Boston, and part of Memorial Drive, a major riverside thoroughfare.
The authorities say that the campus officer, Sean Collier, 27, was shot and killed during an encounter with Tamerlan and Dzhokhar Tsarnaev, the brothers who are also accused of setting off the pair of bombs that killed three people and injured more than 260 others at the marathon.The authorities say that the campus officer, Sean Collier, 27, was shot and killed during an encounter with Tamerlan and Dzhokhar Tsarnaev, the brothers who are also accused of setting off the pair of bombs that killed three people and injured more than 260 others at the marathon.
L. Rafael Reif, president of M.I.T., said at the memorial service that Officer Collier had gotten along so well with the school’s student body that he had gone on hiking trips and on swing dance outings with campus groups. “In just 15 months, he had built a life with us,” Dr. Reif said. “He touched people across our community with his deep kindness.”L. Rafael Reif, president of M.I.T., said at the memorial service that Officer Collier had gotten along so well with the school’s student body that he had gone on hiking trips and on swing dance outings with campus groups. “In just 15 months, he had built a life with us,” Dr. Reif said. “He touched people across our community with his deep kindness.”
Vice President Joseph R. Biden Jr., whose first wife and young daughter died in a car accident in 1972, also spoke at the ceremony, telling Officer Collier’s parents that he knew from experience how the family was suffering. The Tsarnaev brothers, he said, were “two twisted, perverted, cowardly knockoff jihadis.”Vice President Joseph R. Biden Jr., whose first wife and young daughter died in a car accident in 1972, also spoke at the ceremony, telling Officer Collier’s parents that he knew from experience how the family was suffering. The Tsarnaev brothers, he said, were “two twisted, perverted, cowardly knockoff jihadis.”
Mr. Biden praised the nation’s ability to recover from such terror attacks, saying, “We have suffered. We are grieving,” before adding, “But we are not bending.”Mr. Biden praised the nation’s ability to recover from such terror attacks, saying, “We have suffered. We are grieving,” before adding, “But we are not bending.”
Hours earlier, in Boston on Wednesday, Boylston Street, the busy hub that forms the northern boundary of Copley Square, was reopened to the public as the city continued to seek a semblance of the ordinary, nine days after the bombings.Hours earlier, in Boston on Wednesday, Boylston Street, the busy hub that forms the northern boundary of Copley Square, was reopened to the public as the city continued to seek a semblance of the ordinary, nine days after the bombings.
Along with the return of traffic to Boylston Street, the Copley Square Central Library was reopened, and Massachusetts Bay Transit Authority trains resumed service to the Copley Square station — a voice over the loudspeaker making a familiar, if no longer mundane, announcement: “Doors open on the right.”Along with the return of traffic to Boylston Street, the Copley Square Central Library was reopened, and Massachusetts Bay Transit Authority trains resumed service to the Copley Square station — a voice over the loudspeaker making a familiar, if no longer mundane, announcement: “Doors open on the right.”
“It’s like, you’re back to normal,” said Mike Westberry, a 27-year-old university administrative assistant. “Down here, everything looks the same. It’s more difficult, I think, above ground,” he said, referring to the six blocks around Copley Square, where there is now a makeshift memorial of flowers, notes and other tokens that have been left by well-wishers.“It’s like, you’re back to normal,” said Mike Westberry, a 27-year-old university administrative assistant. “Down here, everything looks the same. It’s more difficult, I think, above ground,” he said, referring to the six blocks around Copley Square, where there is now a makeshift memorial of flowers, notes and other tokens that have been left by well-wishers.
For Susan Christiansen, 69, Wednesday meant a morning walk down Boylston Street with her dog and three of her neighbors. They made sure a CVS drugstore was open, and then tried to recall from the surveillance video images they had seen in the media how the bombers had moved through the area before and after the April 15 attack.For Susan Christiansen, 69, Wednesday meant a morning walk down Boylston Street with her dog and three of her neighbors. They made sure a CVS drugstore was open, and then tried to recall from the surveillance video images they had seen in the media how the bombers had moved through the area before and after the April 15 attack.
“Gosh, those people with the bombs were walking the same way we were walking,” Ms. Christiansen said, before turning to one if her companions, Sonia Hauser, 50. “Don’t you feel, kind of, just wary?”“Gosh, those people with the bombs were walking the same way we were walking,” Ms. Christiansen said, before turning to one if her companions, Sonia Hauser, 50. “Don’t you feel, kind of, just wary?”
According to a former law enforcement source who had been briefed on the bombing investigation, the authorities recovered only one gun — a handgun — used by the Tsarnaev brothers, despite the pair engaging in what officials have described as a fierce shootout with the police as the brothers sought to escape capture on Friday.According to a former law enforcement source who had been briefed on the bombing investigation, the authorities recovered only one gun — a handgun — used by the Tsarnaev brothers, despite the pair engaging in what officials have described as a fierce shootout with the police as the brothers sought to escape capture on Friday.
The gun’s serial number was obliterated and so has not yet been traced, said the source, who spoke on the condition of anonymity.The gun’s serial number was obliterated and so has not yet been traced, said the source, who spoke on the condition of anonymity.
The source said that no gun had been recovered from the boat where Dzhokhar Tsarnaev had been captured while trying to hide after he had been wounded by the police. The source said that no gun had been recovered from the boat where Dzhokhar Tsarnaev was captured while trying to hide after being wounded by the police.
Another law enforcement source who participated in the investigation, said that the recovered handgun is a 9-millimeter Ruger. That source, too, said that only one gun had been found, and that no gun had been recovered from the boat. Another law enforcement source who participated in the investigation said that the recovered handgun was a 9-millimeter Ruger. That source, too, said that only one gun had been found, and that no gun had been recovered from the boat.
In Makhachkala, Russia, on Wednesday, a team of officials from the American Embassy in Moscow, including F.B.I. agents, conducted a second day of questioning of the parents of the Tsarnaev brothers at the local office of the Russian Federal Security Service.In Makhachkala, Russia, on Wednesday, a team of officials from the American Embassy in Moscow, including F.B.I. agents, conducted a second day of questioning of the parents of the Tsarnaev brothers at the local office of the Russian Federal Security Service.
An embassy official confirmed the questioning but provided no details about what the parents had told investigators, who arrived in Dagestan, where the parents now live.An embassy official confirmed the questioning but provided no details about what the parents had told investigators, who arrived in Dagestan, where the parents now live.
“The F.B.I. is receiving cooperation from the Russian government in its investigation of the Boston Marathon bombing,” the official said.“The F.B.I. is receiving cooperation from the Russian government in its investigation of the Boston Marathon bombing,” the official said.
The portrait investigators have begun to piece together of the brothers suggests that they were motivated by extremist Islamic beliefs but were not acting with known terrorist groups — and that they may have learned to build bombs simply by logging onto the online English-language magazine of the affiliate of Al Qaeda in Yemen, law enforcement officials said Tuesday.The portrait investigators have begun to piece together of the brothers suggests that they were motivated by extremist Islamic beliefs but were not acting with known terrorist groups — and that they may have learned to build bombs simply by logging onto the online English-language magazine of the affiliate of Al Qaeda in Yemen, law enforcement officials said Tuesday.
The investigation into the bombings is still in its earliest stages, and federal authorities were still in the process of corroborating some of the admissions that law enforcement officials said were made by the surviving suspect in the attacks, Dzhokhar Tsarnaev, 19. But they said some of his statements suggested that the two brothers could represent the kind of emerging threat that federal authorities have long feared: angry and alienated young men, apparently self-trained and unaffiliated with any particular terrorist group, able to use the Internet to learn their lethal craft. The investigation into the bombings is still in its earliest stages, and federal authorities are still in the process of corroborating some of the admissions that law enforcement officials said were made by the surviving suspect in the attacks, Dzhokhar Tsarnaev, 19. But they said some of his statements suggested that the two brothers could represent the kind of emerging threat that federal authorities have long feared: angry and alienated young men, apparently self-trained and unaffiliated with any particular terrorist group, able to use the Internet to learn their lethal craft.
Senator Marco Rubio, a Florida Republican who serves on the Senate Intelligence Committee, told reporters after emerging from a two-hour classified briefing with F.B.I. and intelligence officials Tuesday evening that the suspects were most likely radicalized over the Internet, but that investigators were still searching for possible sources of inspiration or support overseas.Senator Marco Rubio, a Florida Republican who serves on the Senate Intelligence Committee, told reporters after emerging from a two-hour classified briefing with F.B.I. and intelligence officials Tuesday evening that the suspects were most likely radicalized over the Internet, but that investigators were still searching for possible sources of inspiration or support overseas.
“The increasing signals are that these were individuals who were radicalized, especially the older brother, over a period of time — radicalized by Islamist fundamentalist terrorists, basically using Internet sources to gain not just the types of philosophical beliefs that radicalized them, but also learning components of how to do these sorts of things,” Mr. Rubio told reporters.“The increasing signals are that these were individuals who were radicalized, especially the older brother, over a period of time — radicalized by Islamist fundamentalist terrorists, basically using Internet sources to gain not just the types of philosophical beliefs that radicalized them, but also learning components of how to do these sorts of things,” Mr. Rubio told reporters.
“This is a new element of terrorism that we have to face in our country,” Mr. Rubio said. “We need to be prepared for Boston-type attacks, not just 9/11-type attacks.”“This is a new element of terrorism that we have to face in our country,” Mr. Rubio said. “We need to be prepared for Boston-type attacks, not just 9/11-type attacks.”

Jess Bidgood reported from Cambridge, Mass., and Erica Goode and Timothy Williams from New York. Reporting was contributed by William K. Rashbaum and Michael Cooper from New York; Michael S. Schmidt and Eric Schmitt from Washington; Serge F. Kovaleski, Michael Schwirtz, Wendy Ruderman, John Eligon and Dina Kraft from Boston; Andrew Roth from Makhachkala, Russia; and David M. Herszenhorn in Moscow.

Jess Bidgood reported from Cambridge, Mass., and Erica Goode and Timothy Williams from New York. Reporting was contributed by William K. Rashbaum and Michael Cooper from New York; Michael S. Schmidt and Eric Schmitt from Washington; Serge F. Kovaleski, Michael Schwirtz, Wendy Ruderman, John Eligon and Dina Kraft from Boston; Andrew Roth from Makhachkala, Russia; and David M. Herszenhorn in Moscow.

This article has been revised to reflect the following correction:This article has been revised to reflect the following correction:
Correction: April 24, 2013Correction: April 24, 2013

An earlier version of this article, using information supplied by the Massachusetts Institute of Technology, misstated the age of the slain campus officer, Sean Collier. He was 27, not 26.

An earlier version of this article, using information supplied by the Massachusetts Institute of Technology, misstated the age of the slain campus officer, Sean Collier. He was 27, not 26.