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FRESNO, Calif. (AP) _ The transient accused of stabbing a Greyhound bus driver with scissors and causing a crash that killed two passengers pleaded innocent to murder charges Friday.

Arturo Tapia Martinez, 27, pleaded innocent to two counts of murder and one count of attempted murder in Monday's crash 70 miles outside Fresno.

Martinez appeared before a Superior Court judge with bandages on both arms. Sheriff's Lt. Margaret Mims said he tried to kill himself with a razor in jail Thursday.

Witnesses said Martinez stabbed the driver in the neck with a pair of scissors. Besides the deaths, 27 of the 51 people aboard were taken to hospitals.

Authorities have not offered a motive and say Martinez may have mental problems.