Thirty students in dramatic Sydney bus crash

Thirty school students have escaped injury after their bus crashed into five cars in dramatic scenes in Sydney's north.

Police say the bus clipped another bus at Chatswood on Monday afternoon before colliding with another five vehicles.

The force of the crash pushed one car up against a power pole.

Thirty secondary students were on the bus but were uninjured.

One car driver suffered minor injuries after the driver's air bag inflated.