PATTERSON (CBS13) — A FedEx and Amazon truck were involved in a crash on Interstate 5 near Patterson on Thursday morning.

The incident happened a little after 4:30 a.m. on the northbound side of the freeway near Sperry Avenue.

Officers say the incident was a chain-reaction crash. The FedEx truck slowed down to a complete stop as it came upon traffic, but big rig directly behind it didn't notice or wasn't able to stop in time and rear-ended the truck.

Seconds later, an Amazon truck crashed into the second big rig.

No injuries have been reported, but the crash had the whole northbound direction blocked for a time.

The FedEx truck was carrying three pallets of auto refrigerant, but the load didn't spill. Still, the load is being unloaded for safety.

I-5 wasn't fully reopened until just before noon.