A bride to be celebrating her bachelorette party in Northern California was among the five people killed when a stretch limousine burst into flames while crossing a San Francisco bridge, reported ABC News.

The bride's name hast not yet been released, who recently got married, and was celebrating with friends before she planned to return to her native Philippines for a second ceremony next month, her sister told the San Francisco Chronicle.

The car caught fire in the westbound lane of the San Mateo bridge late Saturday, California Highway Patrol officer Art Montiel told ABC News.

"It does not appear [the limo] was involved in a collision, so it just appears that it was a vehicle fire," Montiel said.

Officials believe the fire started in the back of the car before it quickly spread.

"The driver was able to get out, some Good Samaritans did stop and assist and try and pull people from the fire," CHP Officer Amelia Jack said. "We have no idea what actually happened yet, everything as I said is still under investigation."

Four women escaped the limousine and were being treated at two area hospitals for smoke inhalation and burns, according to authorities.

The names of the five victims have not been released.