TEXARKANA, Ark. -- A cockpit fire forced a United Airlines 757 to make an emergency landing at Texarkana Regional Airport on Tuesday. None of the 106 people on board was injured.

There was no word on the cause of the fire, although Federal Aviation Administration Roland Herwig said there was a possibility it was caused by a window heater.

Ninety-nine passengers and a crew of seven were aboard the Orlando, Fla.-to-San Francisco flight, airline spokesman Joe Hopkins said.

"There was no type of commotion, the passengers are just calm," said Carri Jones, the airport's finance administrator. "The landing went very smoothly."

The pilots aboard Flight 275 reported smoke and a small fire in the cockpit, Hopkins said. He said the fire was extinguished before the plane landed.

Airline officials said another plane would be brought in from Denver to carry the passengers on the remainder of their trip.

The airport is on the Arkansas-Texas line southwest of Little Rock.