A massive explosion at a fertilizer plant near Waco on Wednesday night injured dozens of people and sent flames shooting into the night sky, leaving the factory a smoldering ruin following a blast that damaged buildings for blocks in every direction.

The explosion at West Fertilizer in West, a community about 20 miles north of Waco, happened shortly before 8 p.m. and could be heard as far away as Waxahachie, 45 miles to the north.

Tommy Muska, West’s mayor, said at a news conference three hours after the explosion that he didn’t yet know how many people had been injured or killed. He said buildings in a five-block radius from the plant were severely damaged by the explosion.