CHICAGO (CBS)– A massive fire that broke out in the Back of the Yards neighborhood has been contained.

The fire, at 50th and Aberdeen streets, has been upgraded to a level one Hazmat situation due to chemicals in the area.

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The incident started as brush fire and is spreading to buildings and trees in the area.

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The Chicago Fire Department provided an update Thursday just after 7 a.m.

According to CFD, the fire burned trailers and there was a slight explosion.

The spokesperson described the scene as a “junk yard” with tractor trailers in an industrial area.

The fire majority of the fire is out and the incident is still under investigation.

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This developing story.