CORONA (CBSLA.com) — California Highway Patrol officers have closed the Southbound side of the 15 Freeway Saturday after at least two people were injured in a gang related shooting.

According to the Riverside County Sheriff’s Department, members of the Hells Angels and Mongols rival motorcycle gangs opened fire on each other on the Cajalco Road off ramp around 6:30 p.m. near El Cerrito Road.

KCAL9’s Erica Nochlin spoke with officials in the area where traffic has been backed up for over three hours.

Officials said one of the victims is listed in serious condition at Riverside Community Hospital where CPR is being performed on him.

The second victim had non-life threatening injuries, authorities said.

According to officers, a third victim was possibly being transported to a hospital shortly before 9 p.m.

Officials said that side streets leading to the freeway have also backed up as a result of the incident.

Traffic has also jammed up in the area of the Eastbound 91 Freeway, from the Green River exit leading to the 15 Freeway, Nochlin said.

The Southbound side of the freeway remains closed. Traffic was being diverted off the freeway at Ontario Avenue.

According to authorities, Hells Angels members had a rally at their Lake Elsinore meeting spot on Saturday afternoon and the Mongols were to have a similar rally in Riverside at night.

At this time, no arrests have been made.