A man was killed and a woman suffered immediate injuries in a crash on Interstate 15, north of Baker, Wednesday morning that shut down two northbound lanes, authorities said.

The collision was reported a little before 11:30 a.m., just north of Halloran Springs Road. California Highway Patrol officials said in a Wednesday news release emergency personnel arrived on scene and found a silver Dodge Caravan had collided with the rear of a tractor-trailer on northbound I-15.

An elderly man in the front passenger seat of the van was pronounced dead at the scene a little before 12:20 p.m., officials said, and San Bernardino County Sheriff-Coroner Department officials were requested to the scene.

Both vehicles were headed north on I-15 when the crash occurred. For unknown reasons, the driver of the Caravan allowed the right front side of the vehicle to collide into the left rear side of the tractor-trailer, officials said.

The driver of the Caravan was transported by Mercy Air 7 to University Medical Center, Las Vegas for treatment of her injuries. Authorities said the driver of the tractor-trailer and three children in the van escaped injury. No other injuries were reported.

Authorities shut down the northbound No. 2 and 3 lanes due to the crash. The lanes remained closed until 5 p.m. Wednesday, according to CHP traffic logs.

CHP officials said drugs and alcohol are not a factor in this collision.

The crash remains under investigation by the Barstow CHP. Anyone with information is urged to contact the Barstow CHP office at 760-255-8700.