Cal Fire responded to a traffic collision involving two big rigs. Arriving crews located Fedex semi truck with rear end damage to the trailer and packages in lanes. The Trailer also detached from the semi during the crash. The second big rig that crashed suffered major front end damage. The truck also jackknifed causing it to block the 1 to number 4 lanes. Fuel and oil was spilling from the jackknifed semi and firefighters called for hazmat to respond due to the inability to stop the leak. Hwy 60 will be hard closed for an unknown duration pending the clearing of the roadway. Both drivers were uninjured in the crash. The cause of the collision is unknown at this time. The semi that jackknifed possibly rear ended the Fedex truck.