Skateboarder battling for life after colliding with car in SF

File photo of emergency room sign. Red Emergency Sign at Hospital File photo of emergency room sign. Red Emergency Sign at Hospital Photo: Steven G. De Polo / Getty Image Photo: Steven G. De Polo / Getty Image Image 1 of / 1 Caption Close Skateboarder battling for life after colliding with car in SF 1 / 1 Back to Gallery

A 19-year-old skateboarder suffered life-threatening injuries Thursday evening after he collided with a vehicle at an intersection in the Sunnyside neighborhood of San Francisco, police said.

The incident occurred just before 7 p.m. at Foerster Street and Joost Avenue, police said.

The injured man was taken to a hospital, where he was being treated Friday for life-threatening injuries, said Officer Giselle Linnane of the San Francisco Police Department.

The driver of the vehicle stayed behind after the collision and was cooperating with police, according to Linnane.

Police said the cause of the accident is still under investigation.

Kiley Roche is an SFGate intern. Email: kroache@sfchronicle.com Twitter: @KileyRoache