A chemical spill was reported at the Valero refinery in the Houston Ship Channel Thursday, KPRC Local 2 reported.
The Houston Fire Department responded to the sulphur dioxide spill at the refinery on Manchester Street near 97th Street at about 9:55 a.m.
Fire officials said they are treating 20 to 30 people at the scene for inhalation injuries.
Officials are working to determine the wind direction and are taking air samples to determine if the incident poses a threat to the community.
A shelter-in-place has not been issued for area residents.
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