Firefighters work the scene where a fire engulfed several apartment units in the Cedar Riverside neighborhood, in Minneapolis, Jan. 1, 2014.

A fire was reported about 8:15 a.m. following an explosion in a Minneapolis apartment complex, Jan. 1, 2014. Firefighters are on the scene, but their efforts are being hampered by sub-zero temperatures.

The cause of the explosion isn't immediately known.

According to the Associated Press, Robert Ball of Hennepin County Emergency Medical Services says the victims have been rushed to hospitals with injuries ranging from burns to trauma suffered from falling or jumping from windows.