The San Mateo County Sheriff's bomb squad investigated a suspicious backpack that caught fire Thursday evening on Interstate 280 near Redwood City, according to the California Highway Patrol.
The fire was first reported around 6:43 p.m. on northbound 280 near Edgewood Road.
The CHP said after the fire was extinguished, the backpack needed to be X-rayed to ensure that it could be safely removed from the roadway.
A Sig-alert was issued at 7:04 p.m. for all northbound lanes of the roadway, which remained closed until about 8:15 p.m.
Traffic was diverted at Farm Hill Boulevard. Motorists were advised to avoid the area.