CS Monitor 
April 16, 2013
Boston was battered but vigilant on Tuesday as an army of federal agents raced to find out who attacked the city’s historic marathon, leaving three dead and more than 100 injured amid a war zone of shattered glass and bomb debris on Patriots Day.
As of Tuesday morning, no persons or group had claimed credit for twin explosions at the finish line near Boston’s Copley Square. The Pakistani Taliban, a group that has threatened the United States in the past, denied participation, according to the Associated Press.
Law enforcement officials questioned an injured Saudi national at a local hospital, but news stories indicated that the individual appears to have no connection to the case. The Boston Globe reported that he was simply a frightened spectator who had tried to flee but was tackled and restrained by bystanders.
On Monday night agents from the FBI, the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), and other law enforcement agencies raided a unit in a high-rise apartment on Ocean Drive in the seaside Boston suburb of Revere, according to information posted online by a participating local fire department. Several bags, including what appeared to be a large duffel bag, were removed from the scene. Authorities were mum as to the specifics of their suspicions but confirmed that the Revere search was related to the case.