Police at the scene say that a homeowners' grill fire sparked an explosion of a propane tank which led to the subsequent fire.
At least two twin homes were severely damaged by the flames.
Visibility was down to about a city block for about a half a mile around the fire.
Crews from Allentown and Easton showed up to fight the fire.
Two firefighters were transported to a hospital for unknown reasons.
Hours later, the fire was brought under control.
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