The FBI has joined a criminal investigation of what police said appears to be an "intentional attack" on gas service lines in Aspen, Colorado, that left thousands of residents and businesses without heat as temperatures in the skiing mecca plunged to near zero degrees.

Work crews are scrambling to restore gas service, and local authorities handed out electric space heaters to residents still without heat Tuesday, as a storm is forecast to bring up to 8 inches of snow in the Rocky Mountains region this week. Temperatures are forecast to fall to 2 degrees in Aspen on Tuesday night, according to the National Weather Service.

Aspen police said the apparently coordinated acts of vandalism occurred Saturday night at three separate Black Hills Energy gas line sites, one in Aspen and two elsewhere in Pitkin County.

Read more: ABC News