CITRUS HEIGHTS, Calif. (CBS13) — A major accident that caused life-threatening injuries has shut down northbound Sunrise Boulevard at the beginning of rush hour.

Authorities said at silver Toyota veered from the southbound lanes into northbound traffic near the intersection of Wildridge Drive at around 3:40 p.m. Tuesday for unknown reason, striking a motorcycle and becoming wedged between two trees.

The driver of the Toyota and the motorcyclist were both taken to the hospital in critical condition. The identities of the victims have not been realesed.

There is no estimate on when the northbound lanes of Sunrise will reopen.