A harness track barn fire at a county fairgrounds in southwest Ohio early Saturday morning killed two people and an estimated 43 horses, The Associated Press reported. The initial number of equine fatalities was projected at more than 60.

Fire Capt. Krista Wyatt told the AP the barn roof had already collapsed by the time firefighters arrived at the Warren County Fairgrounds, about 25 miles northeast of Cincinnati, after the fire was reported at about 5 a.m.

The victims' identities were not immediately released but leading trainer Lamar Moody said two of his employees were unaccounted for.

Authorities were continuing to investigate the cause of the fire