Update, 11:56 p.m.: A press release sent late Wednesday by the Montgomery County Police Department says that the woman is still alive, but that she suffered life-threatening injuries. The release also said that the vehicle that struck her was a Ride On bus.

Original Post: A woman was struck and killed by a vehicle Wednesday night as she tried to cross a busy Rockville street, Mongtomery County police said.

The accident happened near the intersection of Rockville Pike and Halpine Road about 6 p.m., police officials said. The driver stayed at the scene.

Police released no further details immediately, and said the cause of the accident remains under investigation.