The North Freeway was shut down for hours early Saturday morning following two crashes.

It started around 3:30 a.m. with a three-car pile up near W. Mount Houston Road. Authorities say a driver hit another car which caused both cars to hit a guardrail and a third car.

During that accident investigation, authorities say another driver crashed into a Houston fire truck that was blocking lanes on the freeway.

No injuries were reported from either crash.