Four LAPD officers responding to a party call in West Hills were hurt -- one seriously -- early Saturday morning when a woman apparently fell asleep behind the wheel of a sports car and collided with one of their parked patrol cars, authorities said.

The accident took place about 2 a.m on Fallbrook Avenue just north of Victory Boulevard. Two officers were outside their patrol cars and two others were nearby when the sports car, a late-model black Jaguar, slammed into one of the cruisers, police said.

The impact led to a chain reaction in which two officers were hit by their patrol car, which hit another cruiser, injuring the other two officers.

Three officers were taken to Northridge Hospital Medical Center. One was in serious condition with unspecified internal injuries and a broken leg. There other two officers were treated at the hospital and released.

Investigators determined that the woman, who was also taken to the hospital, was not intoxicated. She too was treated and released.

"The officers were extremely fortunate not to have suffered more devastating injuries than they did," said LAPD Assistant Chief Earl Paysinger.

"Although the collision remains under investigation, the incident serves as a reminder to all motorists of their obligation to remain attentive and alert whenever they're behind the wheel."