UPDATED: Fatal Accident on Northbound 57; Four Lanes Closed Until At Least 5 p.m.

A fatal accident on the northbound 57 freeway is blocking several lanes and causing backup to the 60.

The lanes are blocked at Temple Avenue in Pomona. According to a posting on the Cal Poly Pomona Facebook page, the 57 north of Temple Avenue "will remain congested for several hours today after a motorist collided with a Caltrans truck, resulting in a fatality. Four lanes will remain closed until at least 5 p.m."

UPDATE, 4:45 p.m.: The San Gabriel Valley Tribune is reporting that the driver of the vehicle involved in the accident who died at the scene was a white man around the age of 20.

CHP Officer Christian Cracraft told the Tribune that a Caltrans truck was sweeping when a car, possibly a Toyota Corolla, hit the back of it.