By Peter Cooney WASHINGTON (Reuters) - A congressional report issued on Wednesday on the Boston Marathon bombings urges more cooperation among law enforcement agencies, saying a "greater sharing of information might have altered the course of events." The report by the House of Representatives Homeland Security Committee outlined what it called "missed opportunities" that potentially could have prevented the attack that killed three people and wounded more than 260. Two Chechen brothers who lived in the Boston area, Tamerlan and Dzhokhar Tsarnaev, are suspected of carrying out the bombings last April 15 at the Boston Marathon. Tamerlan Tsarnaev, 23, died after a gunfight with police while he and his brother were trying to flee Boston several days after the attack. The report investigated the U.S. probe of Tamerlan Tsarnaev following a warning to the FBI by Russian authorities in 2011 that he had become radicalized and might return to Russia to join extremist groups there.