TALLAHASSEE, Fla. (AP) — Authorities were investigating Sunday what caused a driver of a decades-old school bus to run a flashing red light and collide with a tractor-trailer causing both to burst into flames killing five people and injuring 25 others.

Wakulla County Sheriff Charlie Creel said Saturday that speed was not a factor in the early morning crash. The driver of the bus, 56-year-old Elie Dupiche of Belle Glade, was hospitalized in critical condition.

Creel said a small child from the bus and the driver of the tractor trailer, Gordon Sheets, 55 of Copiague, New York, died in the crash.

Creed said the bus was headed south on a north-south state road when it collided with the tractor-trailer, which was westbound on U.S. 98 — a Florida coastal highway.

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