BOSTON (AP) — Boston Marathon bombing suspect Dzhokhar Tsarnaev was charged in his hospital room Monday with using a weapon of mass destruction to kill — a crime that carries a possible death sentence.

Tsarnaev, 19, was accused by federal prosecutors of conspiring with his older brother to set off the two pressure-cooker bombs that sprayed shrapnel into the crowd at the finish line last Monday, killing three people and wounding more than 180.