AKIPRESS.COM - 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 Wednesday in a court filing, the Associated Press reported.

The filing argued against a defense motion to throw out suspect Dzhokhar Tsarnaev’s statements to FBI agents because he was questioned without a lawyer.

Prosecutors said the bombs, comments Tsarnaev and his brother 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.

They said Tsarnaev told agents he and his brother, Tamerlan Tsarnaev, acted alone and there were no more bombs.

Dzhokhar Tsarnaev has pleaded not guilty to several federal charges. Prosecutors allege he and his brother planted two pressure cooker bombs near the marathon’s finish line, killing three people and injuring more than 260. His brother was killed during a gun battle with police on April 19, 2013, four days after the marathon bombing.