This video from the USA is called Amateur footage Boston bomb attack.
By Barry Grey in the USA:
FBI, Homeland Security withheld information on Boston bombing suspects from local, state police
11 May 2013
The Boston police commissioner and a top Massachusetts Homeland Security official told Congress Thursday that the local and state police were never informed by the Federal Bureau of Investigation or the Department of Homeland Security of multiple warnings about Tamerlan Tsarnaev prior to the April 15 bombings at the Boston Marathon.
Tamerlan Tsarnaev, 26, and his 19-year-old brother Dzhokhar are the only suspects to date in the twin bombings at the downtown Boston finish line of the race, which killed three people and wounded more than 160 others. Tamerlan was killed in a shootout with police on April 19. Dzhokhar is under arrest at a prison medical facility outside of Boston.
Testifying before the House Homeland Security Committee, Boston Police Commissioner Edward Davis said his department had been unaware that the Russian government contacted the FBI in 2011 to warn of Tamerlan Tsarnaev’s radical jihadist sympathies and his plans to travel to the northern Caucasus and link up with Islamist separatist and terrorist elements from Dagestan and Chechnya. Nor had he been told, he said, that the FBI had questioned the elder Tsarnaev brother and his family, or that Tamerlan subsequently, in 2012, spent six months in the volatile region of southern Russia.