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| Boston Marathon: Obama vows bombers will face justice | Boston Marathon: Obama vows bombers will face justice |
| (35 minutes later) | |
| US President Barack Obama has vowed at a memorial service for victims of the Boston marathon bombing the attack's perpetrators will be held accountable. | US President Barack Obama has vowed at a memorial service for victims of the Boston marathon bombing the attack's perpetrators will be held accountable. |
| He told an interfaith ceremony that everyone had been touched by the attack on their beloved city. | He told an interfaith ceremony that everyone had been touched by the attack on their beloved city. |
| He spoke as it emerged investigators had found clear video images of two potential suspects carrying black bags. | He spoke as it emerged investigators had found clear video images of two potential suspects carrying black bags. |
| Two bombs were detonated near the finish line on Monday, killing three people and injuring more than 170. | Two bombs were detonated near the finish line on Monday, killing three people and injuring more than 170. |
| There were several standing ovations as the president spoke on Thursday at the Cathedral of the Holy Cross, the main Roman Catholic cathedral in Boston. | |
| 'Spirit undaunted' | |
| Before his visit, the president declared a state of emergency in Massachusetts, which would allow the state to access federal funding to deal with the aftermath of the attacks. | Before his visit, the president declared a state of emergency in Massachusetts, which would allow the state to access federal funding to deal with the aftermath of the attacks. |
| President Obama appeared in sombre mood as he joined city leaders, residents and victims at the prayer service. | |
| He told the congregation: "The spirit of this city is undaunted; the spirit of this country shall remain undimmed. | |
| "Everyone of us has been touched by this attack on your beloved city. Everyone of us stands with you. Because after all it's our beloved city too. | |
| "They sought to intimidate us, to terrorise us," President Obama said, adding, "It should be pretty clear by now that they picked the wrong city to do it." | |
| He was applauded as he warned the perpetrators of the attacks they would be brought to justice. | He was applauded as he warned the perpetrators of the attacks they would be brought to justice. |
| "We will find you," he said. "We will hold you accountable." | "We will find you," he said. "We will hold you accountable." |
| Hundreds of people stood outside the cathedral during the service, while police at the bomb site listened to the president's speech on the radios in their patrol cars. | |
| FBI caution | |
| Former Republican presidential challenger Mitt Romney also attended the prayer ceremony. | Former Republican presidential challenger Mitt Romney also attended the prayer ceremony. |
| Mr Obama is later expected to meet emergency workers and the families of victims. | |
| On Thursday Homeland Security Secretary Janet Napolitano said the FBI wanted to speak to two men, but did not say they were suspects. | On Thursday Homeland Security Secretary Janet Napolitano said the FBI wanted to speak to two men, but did not say they were suspects. |
| "There is some video that has raised the question of those that the FBI would like to speak with," Ms Napolitano said. | "There is some video that has raised the question of those that the FBI would like to speak with," Ms Napolitano said. |
| "I wouldn't characterise them as suspects under the technical term, but we do need the public's help in locating these individuals." | "I wouldn't characterise them as suspects under the technical term, but we do need the public's help in locating these individuals." |
| She did not give details of what was seen on the tape. | She did not give details of what was seen on the tape. |
| Ms Napolitano would not say whether the attacks were suspected to be the work of a domestic or foreign group, but said the investigation was continuing "apace". | Ms Napolitano would not say whether the attacks were suspected to be the work of a domestic or foreign group, but said the investigation was continuing "apace". |
| She added that security had been ramped up at airports and transport hubs. | She added that security had been ramped up at airports and transport hubs. |
| The FBI has denied a flurry of reports on Wednesday that a suspect had been arrested. | The FBI has denied a flurry of reports on Wednesday that a suspect had been arrested. |
| Investigators are going through thousands of images taken around the time of the attacks from security cameras, the media and people at the scene. | Investigators are going through thousands of images taken around the time of the attacks from security cameras, the media and people at the scene. |
| Officials have not said if they would publicly release more details of the case. | Officials have not said if they would publicly release more details of the case. |
| Correspondents say authorities are cautious about publicising the relevant images, after the release of pictures relating to a 1996 bombing at the Atlanta Olympics led to the arrest of an innocent security guard, Richard Jewell. | Correspondents say authorities are cautious about publicising the relevant images, after the release of pictures relating to a 1996 bombing at the Atlanta Olympics led to the arrest of an innocent security guard, Richard Jewell. |
| A circuit board and battery pack - parts of a triggering mechanism - has been recovered. | |
| And the lid of a pressure cooker, apparently blown off during the explosion, was found on the roof of a nearby building. | |
| Officials say the bombs consisted of explosives in pressure cookers, one with shards of metal and ball bearings, the other with nails. | |
| Nobody has claimed responsibility for the attack. | |
| The twin blasts killed Martin Richard, aged eight, Krystle Campbell, 29, and Lu Lingzi, a postgraduate student from China. | The twin blasts killed Martin Richard, aged eight, Krystle Campbell, 29, and Lu Lingzi, a postgraduate student from China. |
| Dozens remain in hospital following the bombs, many of them seriously injured. | Dozens remain in hospital following the bombs, many of them seriously injured. |
| It is reported that 10 victims have had limbs amputated. Nails and ball bearings were said to be embedded in their flesh. | It is reported that 10 victims have had limbs amputated. Nails and ball bearings were said to be embedded in their flesh. |
| At least 14 bombing victims, including three children, remain in hospital in a critical condition. | At least 14 bombing victims, including three children, remain in hospital in a critical condition. |