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Kevin Johnson, USA TODAY

A federal grand jury in Boston has returned a 30-count indictment against Dzhokhar Tsarnaev, charging the 19-year-old with murder and the use of a weapon of mass destruction in the deadly Boston Marathon bombings.

The U.S. attorney's office says 17 of the charges could bring life in prison or the death penalty.

Federal authorities were expected to make a formal announcement of the charges at 3 p.m. Thursday in Boston.

Three people were killed when two bombs exploded near the finish line of the annual race on April 15. At least 264 people were injured.

Tsarnaev was injured three days later during a shootout with police that left his 27-year-old brother Tamerlan, a second suspect in the bombings, fatally wounded.

Dzhokhar, who fled the shootout, was arrested early the next day while hiding in a boat in the backyard of a home in Watertown, Mass. He has been held at a prison medical center outside Boston.

Tamerlan was secretly buried in a rural Virginia cemetery.

Authorities say the brothers used shrapnel-packed pressure cooker bombs in the bombing. They are also accused of later killing a police officer.

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