A fire at the Martinez Refining Company prompted a public health advisory, Contra Costa Health said on Saturday, Report informs via CBS News.

A shelter-in-place alert was sent by the county to neighborhoods near the Martinez Refining Company, but it has since been lifted. The City of Martinez said the public health advisory remains in place for the city and parts of Pacheco and Clyde.

The Contra Costa Fire Protection District said six workers at the refinery were injured, and four needed to be hospitalized.