BOSTON — Authorities say Boston Marathon bombing suspect Dzhokhar Tsarnaev faces a 15-count state indictment related to the death of a police officer and a police shootout.

That’s in addition to a 30-count federal indictment returned by a federal grand jury Thursday.

U.S. Attorney Carmen Ortiz and state officials said at a news conference that they’re thinking of the three people killed and 260 people injured when two bombs exploded April 15 near the finish line.

Authorities say the suspects later shot Massachusetts Institute of Technology officer Sean Collier in his cruiser and tried to steal his gun.

Tsarnaev was indicted Thursday on federal charges for which he could get the death penalty. His attorney has declined to comment.

His brother was killed in the shootout with police April 19.