ANDERSON, Ind. (AP) – Thousands of people evacuated because of a magnesium fire at a recycling plant were allowed to return home Saturday, but the blaze still could take days to burn itself out.

The toxic fire erupted at the Advanced Magnesium Alloys Corp. plant Friday afternoon, but explosions forced firefighters out less than three hours later, said police Detective Terry Sollars.

No injuries were reported.

At midmorning Saturday, several dozen fire and police officers remained posted around the plant to keep watch on the fire, which shrank considerably overnight but continued to smolder, Sollars said.

Authorities evacuated 3,000 to 5,000 people from an area about one mile wide and two miles long that fell in the path of the smoke, Sollars said.

U.S. Environmental Protection Agency officials conducted air-quality tests and determined Saturday afternoon that the fire no longer posed a health threat and residents could return home.

Magnesium is a silvery-white, highly flammable metal. Burning magnesium produces irritating or toxic fumes and is typically extinguished using dry sand because water can cause a flare-up or explosion.

“God doesn’t have enough sand in Anderson,” Fire Chief J.R. Rosencrans said. By 9 p.m. Friday, he had decided to let the fire burn itself out.

Sollars said the fire began in an estimated 4,000 to 6,000 pounds of magnesium in one section of the plant. “We’re not sure yet on what the start of it was,” he said.

Twelve to 18 of the plant’s approximately 70 workers were inside at the time, he said.

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