8:00 a.m. Update:

Authorities are warning drivers on the Seward Highway, saying that rock slides could continue this morning in the area of McHugh Creek and Potter Marsh Scales, from mile 111 to 113.

"Drivers are urged to be extra vigilant and use caution traveling in this area," APD said in an alert.

The area already saw one crash this morning, when police say a large rock fell from a cliff and struck the roof of a Kia Forte. The driver of that car was transported to the hospital with life-threatening injuries.

6:38 a.m. Update:

Officers at the scene told KTUU that the Seward Highway is now re-opened after rockslide debris was shifted off the road.

Original Story:

The major highway south out of Anchorage is closed due to what authorities say was nearly a deadly accident.

Mile 111 of the Seward Highway, both north and southbound lanes, were shut down early Friday for a near-fatal crash, the Anchorage Police Department said in an alert.

According to APD, the crash was caused by a rockslide south of the Potter Marsh scales just after 5:00 a.m. The victim's injuries are unclear, but they are being taken to the hospital. Dispatchers said it seems only one vehicle was involved.

APD said that the Department of Transportation is responding to clear the road, but at this time, police don't know how long the road closure will last.

"Unknown length of closure updates will be given as soon as available," APD said in a community alert.