HAGATNA, Guam (AP) — The murder trial of a 22-year-old man charged with killing three Japanese tourists during a rampage on Guam last year opened Monday with the prosecution saying rage triggered the attack, while the defense argued the defendant was mentally ill.

Authorities accuse Chad Ryan DeSoto of barreling his car down a sidewalk, crashing into a convenience store, then getting out and stabbing bystanders during the Feb. 12, 2013, attack that killed the three tourists and injured 11 others, a spate of violence that shocked the island U.S. territory.