A federal grand jury has returned a 30-count indictment against Boston Marathon bombing suspect Dzhokhar Tsarnaev, charging him with using weapons of mass destruction and killing four individuals, among other things.

The April 15 bombing left three people dead and more than 260 injured. Authorities believe 19-year-old Mr. Tsarnaev, also known as Jahar, carried out the bombings with his 26-year-old brother, Tamerlan Tsarnaev, who died after a shootout with law enforcement a few days later. The brothers are also accused of fatally...