Updated: 06:33, Monday April 22, 2013
Investigators believe two brothers suspected in the Boston Marathon bombings were likely planning other attacks based on the cache of weapons uncovered.
As Boston-area residents came together in prayer and reflection after a tumultuous week, the lone surviving suspect in the bombing lay hospitalised under heavy guard apparently in no shape for interrogation.
Boston Police Commissioner Ed Davis said authorities found an arsenal of homemade explosives after Friday's gun battle between police and the two suspects.
'We have reason to believe, based upon the evidence that was found at that scene - the explosions, the explosive ordnance that was unexploded and the firepower that they had - that they were going to attack other individuals,' Davis told CBS television. 'That's my belief at this point.'
The scene of the gun battle was loaded with unexploded bombs, and authorities had to alert arriving officers to them and clear the scene, Davis said. One improvised explosive device was found in the Mercedes the brothers are accused of carjacking, he said.
'This was as dangerous as it gets in urban policing,' Davis said.
US officials said the elite interrogation team would question Tsarnaev without reading him his Miranda rights, which guarantees the right to remain silent and the right to a lawyer. Such an exception is allowed on a limited basis when the public may be in immediate danger, such as instances in which bombs are planted and ready to go off.
American Civil Liberties Union executive director Anthony Romero said the legal exception applies only when there is a continued threat to public safety and is 'not an open-ended exception' to the Miranda rule.
Massachusetts Governor Deval Patrick said surveillance video from the Boston Marathon attack shows Dzhokhar Tsarnaev dropping his backpack and calmly walking away from it before the bomb inside it exploded.
'It does seem to be pretty clear that this suspect took the backpack off, put it down, did not react when the first explosion went off and then moved away from the backpack in time for the second explosion,' Patrick told NBC television. 'It's pretty clear about his involvement and pretty chilling, frankly.'
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