Copter Slams into Maryland Highway

Four people are dead in western Maryland after a commercial helicopter slammed into an interstate highway late Thursday night. The cause of the accident is unclear: witnesses say they saw bright arcs of electricity shooting out as the helicopter struck a power line, but the aircraft may already have been on the way towards crashing before the collision. Low visibility caused by fog might also have been a factor in the accident. No cars were hit when the helicopter crashed into the highway.