Philadelphia police are looking for the drivers of two vehicles who were apparently racing each other when one of the cars struck and killed a pedestrian early this morning on Roosevelt Boulevard.

A 30-year-old woman was hit by a gold or silver Pontiac Bonneville or Oldsmobile as she tried to cross the outer northbound lanes at 12:03 a.m., said Accident Investigation Sgt. Larry Ritchie.

The woman, whose name was not released pending notification of relatives, lived nearby, Ritchie said. It appeared that she had just gotten some takeout food that she was carrying at the time, he said.

The sedan that struck the woman was speeding alongside a second vehicle, described as a white Dodge Neon with a blue stripe along its side.

"The cars were racing each other," Ritchie said.

The drivers did not stop, witnesses told police.

Investigators shut down the northbound outer lanes for at least two hours after the accident. Police are asking anyone seeing a vehicle matching either description to contact accident investigators at 215-685-3180.

Contact staff writer Larry King at 215-345-0446 or lking@phillynews.com.