FOSTER CITY -- Five women died Saturday night when they were trapped inside a limo that had caught fire as they were traveling on the westbound San Mateo-Hayward bridge in Foster City.

CHP officer Art Montiel said the women were traveling from Alameda to Foster City. Four women and the driver of the vehicle managed to escape from the fire, which was reported just after 10 p.m.

Montiel said the incident did not involve a collision.

Montiel said officials did not know where the women were going at the time of the fire. He said the San Mateo County coroner will release the names of the women who died after their families have been notified.

Early Sunday, the CHP released the names of those who survived: driver Orville Brown, 46, of San Jose, who was uninjured; and passengers Jasmine Desguia, 34, of San Jose; Mary G. Guardiano, 42, of Alameda; Nelia Arrellano, 36, of Oakland; and Amalia Loyola, 48, of San Leandro. The four women suffered moderate injuries.

The incident began at 10:09 p.m. when CHP officers responded to reports of a vehicle fire on Highway 92 in Foster City, just east of Pier 1. The car was a white Lincoln town car and was traveling in the slow lane. For unknown reasons, the car caught fire.

Ten people were inside the vehicle at the time, including nine women and the driver, Montiel said.

Four women and the driver escaped. Five of the women, however, were unable to escape from the vehicle and were confirmed dead when officers arrived on-scene.

Two of the four women who escaped were taken to Stanford Hospital and two others were taken to Valley Medical Center in San Jose. All four are being treated for smoke inhalation and burns.

It appears the fire started in the back of the limousine, but specifically where or how is still under investigation.

All westbound lanes of the highway were closed for several hours, though one lane was reopened about 1 a.m. with officials still on the scene investigating.

ABC7 contributed to this report.