A chemical spill injured dozens of people, some seriously, and forced hundreds to evacuate from a western Oklahoma city on Wednesday night, according to local officials.

The incident occurred around 10 p.m. local time in Weatherford, Oklahoma, where an 8,500-gallon tanker truck began leaking toxic ammonia, Weatherford Police Chief Angelo Orefice told CBS News on Thursday morning. Responding crews stopped the leak, he said.

The truck was parked in the lot outside of a Holiday Inn Express hotel, said Weatherford Emergency Manager Mike Karlin at a news conference streamed by CBS affiliate KWTV. When first responders arrived at the scene, they found people in respiratory distress and exiting the hotel, according to the emergency manager.

"As the event unfolded, we had a large plume of anh

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