The driver of a sports utility vehicle was killed Tuesday afternoon after apparently being shot in the head as he drove near the Walnut Lane bridge in Northwest Philadelphia, police said.

The crash happened around 12:30 p.m. along Walnut Lane near Parkline Drive on the borders of the city's West Mount Airy and Germantown neighborhoods, police said.

The unidentified driver crashed into a car, then flipped his SUV moments after he was shot, police believe. He was found a few feet from the vehicle.

The search was on within minutes of officers arriving at the scene for a woman seen running by witnesses.

Police said witnesses saw the woman running west on the bridge toward Henry Avenue. They said she may have thrown a jacket off the bridget.

A bystander called 911 for help after the Ford Expedition crashed. When paramedics arrived, they found the 33-year-old male driver had been shot once in the temple.

He was pronounced dead at the scene, police said.

The crash happened at the western foot of the Walnut Lane bridge, which spans the Wissahickon Creek and connects the neighborhoods with Roxborough.

A large number of police set up a perimeter around the scene as they searched for a possible shooter and evidence.

Officers ventured into the woods near the creek to search the area as well.

So far, no one has been taken into custody.