REDLANDS (CBSLA.com) — Three people were killed and six more suffered major injuries in a head-on collision in Redlands Thursday morning, according to authorities.

Greg Mills, reporting for CBS2 and KCAL9, said the three deceased were all traveling in the same minivan. The fatalities included a two men and one woman.

Police told Mills only two of the eight people in the minivan were wearing seat belts.

The driver of the other vehicle, a commercial van, was also injured.

Mills said that driver, the only occupant of his vehicle, suffered a broken leg and broken ankle. The driver underwent an operation Thursday afternoon.

The accident occurred at Orange Street between Pioneer and the Santa Ana River wash, just after 9:30 a.m., according to officials.

The cause of the crash is under investigation.

Mills reported that it appears the minivan was going northbound on Orange and slammed on its brakes before veering into traffic in the right lane.

Orange Street remained closed for much of the day.