California Highway Patrol officers and emergency officials responded to a big rig collision in Castaic Tuesday morning.

The accident occurred on the southbound Interstate 5 freeway near the north lower crossover at 8:24 a.m. and crews are still on scene as of 11:30 a.m.

“Two semis are involved in the collision,” said CHP Officer Clive Sheen of the Newhall Station. “One jackknifed and hit the roadside rail. The driver who caused the accident is suspected of being under the influence.”

CHP officials issued a SIGALERT and closed the left three lanes of the freeway.

CHP officers reported liquid leaking from one of the trucks onto the freeway around 8:31 a.m. and stopped the leakage around 9:22 a.m.

Los Angeles County Fire Department Hazardous Materials officials were called to the scene around 10:22 a.m.

It is unknown if there are any injuries.

UPDATE 11:47 a.m.

CHP Officers report that one of the truck’s cabs caught fire  at 11:36 a.m. The fire was reported out and battery wires to the truck were cut minutes later.

A driver of a blue Oldsmobile and other motorists are reportedly cutting through a fence onto Frontage Road to exit the freeway, CHP officers report.

UPDATE 2:50 p.m.

The SIGALERT was cancelled at 1:29 p.m. All lanes are open.

UPDATE 3:06 p.m.

Gregory Dean Wall, 50, of Gilroy, was allegedly driving under the influence when he collided with the back of a truck driven by Steven Brust, 69, of Compton, according to a CHP news release. Brust’s truck crossed all of the lanes and collided with the center guardrail. Wall’s truck crossed all of the lanes as well, coming to rest on the east side of the southbound I-5 freeway.

The collision resulted in Brust’s truck sustaining a minor fuel leak of about 20 gallons and he was treated for minor injuries, according to the news release. Wall was arrested and booked at the Santa Clarita Valley Sheriff’s Station.

This is a breaking news story and will be updated as more information becomes available.