BOSTON (AP) — A federal indictment accusing Boston Marathon suspect Dzhokhar Tsarnaev of carrying out the April bombings says the teenager had the information he needed to make explosives with a pressure cooker easily accessible on the Internet in jihadist files.

The 30-count indictment returned Thursday provides one of the most detailed public explanations to date of the Tsarnaev brothers' alleged motive — Islamic extremism — and the role the Internet may have played in influencing them.

It contains the bombing charges, punishable by the death penalty, that were brought in April against the 19-year-old, including use of a weapon of mass destruction to kill.

The indictment makes no mention of any overseas influence.

Tsarnaev will be arraigned July 10.