The Darien teen who suffered head injuries after being struck by a car Saturday afternoon has been upgraded to stable condition, according to Darien Police Sgt. Jeremiah Marron.

The 15-year-old boy, whose name is not being released, was struck by a gray or silver, "newer model" Toyota Camry with Connecticut license plates, traveling northbound on Hoyt Street, across from St. John's Cemetery at 2:30 p.m. Saturday. The car slowed after the collision, but did not stop, police said.

The victim was transported to Stamford Hospital, where he was originally listed in critical condition with severe head injuries.

The section of the road where the collision occurred was closed for several hours following the accident, and police returned to canvass the area 24 hours after the original incident took place.

"Anyone with serious injuries, involving an evading vehicle becomes a more complex process," Marron said. "It's more difficult to arrive at a determination of cause when you don't have all the pieces."

Police are looking for more information about the accident.

"We're asking for anyone who saw the collision take place to come forward, or if anyone knows anything about the offending vehicle to give us a call," Marron said. "We'd welcome anonymous information at this point."

Marron said that anyone with information can contact the police by calling 203-662-5300.