Explosives residue found in slain suspect's apartment

In a fresh development in the Boston Marathon bombings probe, US investigators have found explosives residue in the apartment of the slain Chechen-origin suspect Tamerlan Tsarnaev.

He is the main accused in the Boston bombings along with his 19-year-old brother Dzhokhar. Tamerlan, 26, was shot dead by police in the wee hours of April 19.

As part of the continuing probe into the attacks, investigators have found explosives residue in the apartment that Tamerlan shared with his wife and young daughter, a source briefed on the investigation has said. The residue turned up in at least three places at the apartment in Cambridge, Massachusetts, the CNN reported.

The residue was found at the kitchen table, the kitchen sink and the bathtub, the source said. The US authorities have arrested Dzhokhar on charges of using a weapon of  mass destruction.