The first police shootout occurred about 1 a.m. Friday in Watertown, touched off by the shooting death of a university policeman on the MIT campus in neighboring Cambridge. The Tsarnaev brothers, meanwhile, had carjacked a black Mercedes SUV in Cambridge, and were soon pursued by police, exchanging gunshots with the officers and throwing homemade pipe bombs at them. The chase ended in Watertown where the older brother was felled in a hail of bullets. Authorities said he was wearing a small bomb strapped to his chest. His younger brother, who was also hit by gunfire, sped from the scene in the SUV, then abandoned it and fled on foot.
The second police gunfight occurred 18 hours later when police were discovered the fugitive suspect hiding in the backyard boat, where he apparently took refuge most of the day. Several shots were exchanged before police dragged the wounded suspect from the boat's cockpit, handcuffed him and took him to the hospital for medical treatment.
Authorities said once the suspect is out of medical danger, he will be interrogated by a special federal government interrogation team made up of FBI, CIA and Defense Department officials. He will not have a lawyer present because he is considered a national security risk.
U.S. Attorney Ortiz said the special interrogatin team will seek to determine if the brothers had help in plotting the marathon bombings and where they got the materials for the pressure cooker bombs they used.
"We owe it to the victims and the American public to get to the bottom of this terrorism," she said.
Meanwhile, the FBI confirmed a report that the older brother, Tamerlan Tsarnaev, had been questioned by agents in 2011 after a tip from a foreign country that he was a "follower of radical Islam" and planned to join an underground group.
The FBI said the agnts could not find "any terrorism activity, domestic or foreign."
The brothers emigrated to the United States from Russia a decade ago with their parents, who sought political asylum from the civil war in Chechenya. The parents later returned to Russia but the brothers and a sister stayed in America. The younger brother became a naturalized U.S. citizen in September of 2011.