GREELEY, Colo. (CBS4) – Numerous explosions have been seen during a fire at a wastewater injection well tank site in Weld County.

The site is located near the intersection of Weld County Road 47 and Weld County Road 64, just northeast of the Greeley Airport. Fracking wastewater, which does contain some petroleum, is stored at the site.

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(credit: CBS)

(credit: CBS)

Three homes were evacuated near the fire, which started at approximately 1 p.m. No injuries have been reported.

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Emergency crews said they are expecting to remain on the scene for an extended period.

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“We’re holding firefighters away due to venting and possible exploding tanks,” said Greeley Fire Department spokesman Dale Lyman. “We’re waiting until that slows down and we ‘re not in harm’s way.”