VANDERGRIFT, Pa. (AP) _ A Norfolk Southern freight train derailed northeast of Pittsburgh Monday evening, sending at least two cars into the Kiskiminetas River.

Norfolk Southern spokesman Rudy Husband said 12 to 19 cars of a 122-car train derailed, including four cars carrying molten sulfur, which is classified as a flammable hazardous material. The sulfur-carrying cars remained upright and intact. Most of the other derailed cars also remained upright, he said.

The two cars that fell into the river were a tanker loaded with antifreeze and a freight car carrying a load of steel, Husband said.

``At this point, it does not appear to be leaking,'' Husband said.

The cause of the derailment was under investigation. No injuries were reported.

The train originated in Conway and was headed to Roanoke, Va. It derailed near Vandergrift, a town about 25 miles northeast of Pittsburgh.