A driver on a Los Angeles freeway was fatally shot in the head early Sunday, hours after another driver was shot in an attack about 30 miles away, the authorities said. The shootings were the latest in a string of attacks on Southern California freeways that have alarmed motorists and the authorities reports the New York Times.

Investigators said they did not know what led to the fatal shooting Sunday, on Highway 101 in the San Fernando Valley. The car crashed near a freeway ramp, so the victim may have been shot before entering the highway, said Officer Norma Eisenman of the Los Angeles Police Department. The wreck snarled traffic for hours near the Van Nuys district.

“There’s absolutely no witnesses at this time, no information,” Officer Eisenman said.

The second shooting, on Saturday night, was in Long Beach, where the victim was able to drive himself off the freeway and phone for help, said Officer Jackie Bezart of the Long Beach Police Department.

The man told officers another motorist shot at him as the result of road rage along Highway 710, Officer Bezart said. The man was hospitalized with injuries that were not life-threatening.

Investigators do not think the cases were related to three other shootings, two fatal, in recent weeks on Southern California freeways.

Read it here: 2 Freeway Shootings, 1 Fatal, Extend a String in California