The incident happened on Dixon Avenue around 4:25 p.m. Tuesday.
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Workers were mixing products at AlPak Soap, located at 175 Dixon Avenue when there was a delay in the mixing process that caused a plume of gas to form.
The workers, as well as houses across the street, were evacuated.
No one was injured.
As of 8:30 p.m. the cleanup was continuing by Hazmat crews and Dixon Avenue remained closed between Albany and Bay View Ave.
Residents were allowed back in their homes around 6:30 p.m.