CHATSWORTH (CBS) — Authorities are searching for a man who reportedly caused a fatal collision with a motorcyclist Saturday in Chatsworth before fleeing the scene.

READ MORE: One Crew Member Killed, Second Wounded After Alec Baldwin Discharges Prop Gun On Movie Set In New Mexico

The accident in the 20900 block of Nordhoff Street was reported sometime after 1 p.m., according to an alert issued by the Los Angeles Fire Department.

A male driving a white Ford pickup truck reportedly collided with another man driving a Harley Davidson motorcycle.

Witnesses say the driver of the truck never stopped.

READ MORE: Alec Baldwin On Fatal Movie Set Shooting Of Director Of Photography Halyna Hutchins: ‘There Are No Words’

“We followed him up the street in our motor home,” said witness Helen Kelly. The driver escaped into traffic before Kelly could get his license plate number.

Kelly said the driver of the truck had black hair and a mustache, and appeared to be around 30 years of age.

LAFD Spokesman Brian Humphrey said the intersection of Nordhoff Street and DeSoto Avenue was closed in all directions while Los Angeles police investigated the accident.

The victim, identified only as a 25-year-old white male, was reportedly wearing a helmet at the time of the crash. He was pronounced dead at the scene, Humphrey said.

MORE NEWS: Robert Durst Charged With Murder In Former Wife’s Disappearance

No other injuries were reported.