Two children and a man were killed in an Interstate 5 traffic crash in the early morning hours Monday, CHP officials said.

A 1997 Honda Accord driven by an unidentified man was heading southbound on I-5, and for unknown reasons, his car slammed into a truck parked at a designated brake check on I-5, near Templin Highway around 1 a.m., according to a CHP news release.

The 2006 Freightliner towing a 2003 utility semi trailer was inside the brake check area at the east curb of the brake check, with the driver asleep in the sleeper berth.

“For unknown reasons the driver of the Honda Accord veered left as it approached the big rig and struck the rear of the big rig prior to any evasive action by the driver,” according to a CHP news release.

Emergency response teams received the call at 1:17 a.m. and officials were on scene by 1:30 a.m., according to Fire Department Inspector Flores.

The big rig driver was uninjured in the crash.

The Honda was wedged underneath the big rig upon arrival of emergency personnel. The driver, right front passenger, which was a male child, and a left rear passenger, a female child, were all declared dead at the scene.

The age and identification of the victims were not immediately available.

The entrance to the Whitaker Brake Check was closed for approximately six hours while the crash was investigated.

Parties have not yet been identified because the Los Angeles County Coroner has not yet notified the deceased’s next of kin.

Los Angeles County Sheriff Department, Santa Clarita substation is now handling the investigation, according to a CHP report.