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| Version 1 | Version 2 |
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| Boston Marathon: Obama to attend bomb ceremony | Boston Marathon: Obama to attend bomb ceremony |
| (34 minutes later) | |
| US President Barack Obama is in Boston to attend a memorial service for victims of Monday's Boston marathon bombing. | |
| Two bombs were detonated near the finish line, killing three people and injuring more than 170. | Two bombs were detonated near the finish line, killing three people and injuring more than 170. |
| The president will address an interfaith service as the search for suspects continues. | The president will address an interfaith service as the search for suspects continues. |
| Investigators say they have found images of a potential suspect from surveillance camera footage. | Investigators say they have found images of a potential suspect from surveillance camera footage. |
| Roads were closed around the Cathedral of the Holy Cross, the main Roman Catholic cathedral in Boston, ahead of the president's visit. | Roads were closed around the Cathedral of the Holy Cross, the main Roman Catholic cathedral in Boston, ahead of the president's visit. |
| A heavy police presence was seen in the area as residents waited - some arriving before dawn - for one of about 2,000 seats inside. | A heavy police presence was seen in the area as residents waited - some arriving before dawn - for one of about 2,000 seats inside. |
| People were reportedly being turned away around 09:00 local time (13:00 GMT). | People were reportedly being turned away around 09:00 local time (13:00 GMT). |
| 'Verge of arrest' | 'Verge of arrest' |
| Boston City Council President Stephen Murphy said a man was seen dropping off a bag at the scene on Monday, as investigators worked to identify possible suspects. | Boston City Council President Stephen Murphy said a man was seen dropping off a bag at the scene on Monday, as investigators worked to identify possible suspects. |
| The FBI has denied earlier widespread reports that a suspect had been arrested. | The FBI has denied earlier widespread reports that a suspect had been arrested. |
| Mr Murphy said detectives had spotted the potential suspect in surveillance footage from a nearby department store, the Associated Press news agency reported. | Mr Murphy said detectives had spotted the potential suspect in surveillance footage from a nearby department store, the Associated Press news agency reported. |
| He said he did not know whether investigators had identified the man, but added: "They may be on the verge of arresting someone and that's good." | He said he did not know whether investigators had identified the man, but added: "They may be on the verge of arresting someone and that's good." |
| Investigators have been sifting through thousands of pieces of evidence, ranging from video recorded on mobile phones to fragments of shrapnel removed from the victims. | Investigators have been sifting through thousands of pieces of evidence, ranging from video recorded on mobile phones to fragments of shrapnel removed from the victims. |
| Officials said a circuit board and battery pack - parts of a triggering mechanism - had 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 said a circuit board and battery pack - parts of a triggering mechanism - had been recovered and the lid of a pressure cooker, apparently blown off during the explosion, was found on the roof of a nearby building. |
| The bombs are believed to have consisted of explosives placed in 1.6-gallon (6-litre) pressure cookers, one with shards of metal and ball bearings, the other with nails. | The bombs are believed to have consisted of explosives placed in 1.6-gallon (6-litre) pressure cookers, one with shards of metal and ball bearings, the other with nails. |
| Nobody has claimed responsibility for the bombs, which a source said had been placed in black bags and left on the ground. | Nobody has claimed responsibility for the bombs, which a source said had been placed in black bags and left on the ground. |
| 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. |
| Shards and shrapnel | Shards and shrapnel |
| Dozens remain in hospital following the bombs, many of them seriously injured. | Dozens remain in hospital following the bombs, many of them seriously injured. |
| A number of victims have had limbs amputated. | A number of victims have had limbs amputated. |
| Boston Medical Center trauma surgery chief Peter Burke said hospitals were saving "large quantities" of fragments extracted from victims as evidence for the police. They include metal, plastic, wood and concrete. | Boston Medical Center trauma surgery chief Peter Burke said hospitals were saving "large quantities" of fragments extracted from victims as evidence for the police. They include metal, plastic, wood and concrete. |
| "We have a lot of lower extremity injuries, so I think the damage was low to the ground," Dr Burke said. | "We have a lot of lower extremity injuries, so I think the damage was low to the ground," Dr Burke said. |
| "The patients who do have head injuries were blown into things or were hit by fragments that went up." | "The patients who do have head injuries were blown into things or were hit by fragments that went up." |
| At least 58 of the injured have been released from various hospitals around the city, according to AP. | At least 58 of the injured have been released from various hospitals around the city, according to AP. |
| Of those that remain, a five-year-old child, a nine-year-old girl and 10-year-old boy were among 17 victims listed as in a critical condition. | Of those that remain, a five-year-old child, a nine-year-old girl and 10-year-old boy were among 17 victims listed as in a critical condition. |
| The first explosion went off close to the finish line at about 14:50 local time (18:50 GMT) on Monday. | The first explosion went off close to the finish line at about 14:50 local time (18:50 GMT) on Monday. |
| Seconds later, as rescuers were rushing to help the injured, another explosion went off nearby. | Seconds later, as rescuers were rushing to help the injured, another explosion went off nearby. |
| The London marathon - the next major international marathon - is to go ahead on Sunday. | The London marathon - the next major international marathon - is to go ahead on Sunday. |
| Organisers have said they will hold a 30-second silence at the start as a mark of respect. | Organisers have said they will hold a 30-second silence at the start as a mark of respect. |