ANTIOCH (CBS SF) — Fire crews in the East Bay have extinguished a vegetation fire that appeared to have started in an Antioch homeless encampment Friday morning, according to authorities.

The Contra Costa Fire Twitter account posted about the fire at around 10:24 a.m. and asked Antioch residents to avoid the area of 1300 West 4th Street.

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Authorities did not offer details on what may have exploded in the area. Contra Costa Fire later confirmed that the fire had started in a homeless encampment and was extinguished by 10:37 a.m.

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The fire was kept from threatening any structures in the area. Crews remain on the scene mopping up the fire and investigating the cause.