A three-alarm fire tore through an abandoned school in Covina early Tuesday morning. The fire was reported at an abandoned adult school in the 16200 block of East San Bernardino Road at about 2:40 a.m., according to the Los Angeles County Fire Department. Crews were still battling the flames as of 4:30 a.m. There was no word of any injuries. Officials did not disclose what may have sparked the blaze.