Video: Barack Obama: Boston Marathon bombings victims' families deserve answers But the President acknowledged that many unanswered questions remained about the motivations of the two men accused of perpetrating the attacks that unnerved the nation. "The families of those killed so senselessly deserve answers," he said. The wounded, some of whom now have to learn how to stand, walk and live again deserve answers. And so I've instructed the FBI and the Department of Homeland Security and our intelligence community to continue to deploy all the necessary resources to support the investigation, to collect intelligence and to protect our citizens. The suspect had been holed up in a boat in a Watertown, Massachusetts, neighbourhood. His older brother, also a suspect in the bombings, was killed earlier on Friday in an attempt to escape police, authorities said. Three people were killed and more than 180 injured in Monday's twin marathon explosions. The manhunt to track down the suspects resulted in the death of an MIT (Massachusetts Institute of Technology) policeman and severely wounded another officer. The two suspects were identified by authorities and relatives as ethnic Chechens from southern Russia who had been in the US for about a decade and were believed to be living in Cambridge, Massachusetts. The capture of the second suspect capped a frenzied week in Boston, Washington and elsewhere around the country.