(WVLT) - Alcoa city officials ordered a shelter in place after an Ammonia chemical leak at US Foods Friday ... from that drone video and shut off two valves, saying it was a valve malfunction.

“We are still working with the professionals through this process to ensure ... out from a pressure release valve of a ...

Food particles, grease, or debris may be stuck inside the release valve, preventing a proper seal. You can remove the steam ...

"So we don't know if that container had a leak or a valve, but we were able to mitigate that. It mixed with another chemical that was spilled, which gave us our our problem today." Two nearby ...