FLUSHING TOWNSHIP, Mich. (AP) _ A 30-foot cinder block wall collapsed Monday at a high school, killing four construction workers and injuring two others.

The accident happened at about 1:45 p.m. as crews were working on a new auditorium at Flushing High School.

The collapse killed four workers and sent two others to hospitals in Flint, said Police Chief Doug Kennedy. One was in critical condition and the other was fair.

Authorities had no word on what caused the wall to collapse on the masons and electricians.

Investigators from the Michigan Occupational Safety and Health Administration arrived and were talking photographs and interviewing witnesses.

Only a pile of gray rubble remained where the wall once stood. A scaffolding that had been alongside the wall, however, remained upright.

Construction on the 17,500-square-foot auditorium began in May and was set for completion in April 1999. The high school, 10 miles northwest of Flint, is scheduled to open Aug. 31 as scheduled.