Crews are working to put out a fire that is still smoldering near the border, and are warning that flames could pose a health hazard.

The fire broke out in a junkyard in the 6400 block of Lonestar Road just before midnight.

The fire burned plastics and metals and forced hazardous materials teams to the scene.

It took firefighters more than an hour to control the blaze, using foam.

The cause of the fire is under investigation.

There was no report of any injuries.