Boston Marathon bombings suspects used fuses made from Christmas lights ...

The Boston Marathon bombing suspects used 'relatively sophisticated' bombs with fuses made from Christmas lights and remote-control detonators made from model car parts, federal prosecutors said.

A court filing by prosecutors Wednesday argues against a defense motion to throw out suspect Dzhokhar Tsarnaev's statements to FBI agents because he was questioned without a lawyer.

'In light of the history of coordinated terrorist attacks (and planned attacks) such as the ones in Mumbai, India, Times Square, the New York subway system, and on September 11, the FBI had a duty to be investigate whether any additional attacks were imminent,' the filing said. 'Interviewing Tsarnaev as soon as possible was therefore essential to protect the public from possible harm.'

Prosecutors say the bombs, comments Tsarnaev and his brother, Tamerlan, made to a carjacking victim that they might explode more bombs in New York and a note Tsarnaev wrote in a boat where he was captured made it imperative to know if there was a continuing terror threat before informing him of his rights, an allowed exception.

They say Tsarnaev said he and his brother acted alone and there were no more bombs.

Three people were killed and more than 260 were wounded in the April 15, 2013 attacks. Dzhokhar Tsarnaev has pleaded not guilty and faces the death penalty. Tamerlan Tsarnaev was killed days after the attack in a shootout with police.

news3blog.blogspot.com contributed to this report.