Investigations are continuing into the Boston Marathon bombings.
FBI agents are combing through a garbage dump near the University of Massachusetts Dartmouth, where the sole surviving suspect, 19-year-old Dzhokhar Tsarnaev, was a student.
Tsarnaev, an ethnic Chechen who immigrated to the United States as a child, is charged with plotting the April 13 bombing together with his older brother, Tamerlan, who died after a gunbattle with police last week.
Tsarnaev faces life in prison or the death penalty if convicted.
Investigators have also revealed that the men’s mother, Zubeidat Tsarnaeva, had been put on a terrorist watch list in 2011 together with Tamerlan.
Three people were killed and more than 260 wounded when two homemade bombs were detonated near the finish line of the Boston Marathon.
Based on reporting by the AP and "The New York Times"