Bomb suspect’s cause of death still not declared

 (AP Photo/FBI)

BOSTON – Massachusetts’ chief medical examiner is still working to figure out what killed the Boston Marathon bombing suspect who unleashed gunfire and explosives on police before dying during a gateway attempt.

Terrel Harris of the state Executive Office of Public Safety and Security said the medical examiner hasn’t determined the cause of death of 26-year-old Tamerlan Tsarnaev.

Tsarnaev and his brother, 19-year-old Dzhokhar, are accused of planting two explosives near the marathon finish line Monday, killing three and injuring more than 180. A motive remains unclear.

Police said Tamerlan was run over by a car driven by his brother as he fled gunfire Friday. The younger brother was captured Friday night after a gun battle with police and remains hospitalized in serious condition.