HOUSTON (AP) A 17-year-old charged in the fatal stabbing of a fellow Houston-area student has told investigators the altercation began when he bumped a different youth in the school cafeteria.

But Harris County Sheriff's Office investigators said Thursday that gang rivalry appears to be the motive in the slaying at Spring High School in Spring.

Luis Alonzo Alfaro was being held on a murder charge in Wednesday morning's killing of 17-year-old Joshua Devon Broussard.

Alfaro made a court appearance early Thursday where details of his interview with detectives were disclosed. Alfaro, who's jailed on $150,000 bond, also asked for a court-appointed attorney. He has another court appearance set for Friday.

Classes have been canceled at Spring High School, about 20 miles north of Houston, until Monday.