Boston Marathon bombing suspect Dzhokhar Tsarnaev scrawled anti-American messages inside the boat where he lay wounded, according to US federal prosecutors.
He also downloaded bomb-making instructions from an al-Qaeda magazine and gathered online material on Islamic jihad and martyrdom.
The 30-count indictment released on Thursday contains the bombing charges, punishable by the death penalty, that were brought in April against Tsarnaev, 19, including use of a weapon of mass destruction. It also contains many new charges covering the killing of a police officer and the carjacking of a motorist during the getaway attempt that left his older brother, Tamerlan, dead.
Three people were killed and more than 260 wounded by the two pressure-cooker bombs that went off near the finishing line of the marathon on April 15.
Tsarnaev was captured four days later, hiding in the boat parked in a backyard in Watertown, a suburb of Boston.