A truck has hit the top of a Wellington tunnel before nearly reversing into a bus, police say.

Emergency services are on the scene at Seatoun Tunnel, where a container truck hit the top of the tunnel heading in, a police spokeswoman said.

The accident happened at the Seatoun end of the tunnel a short time before 1pm.

The truck then began backing out of the tunnel, nearly bumping into a bus that was behind it, the spokeswoman said.

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However the bus was not hit and was able to continue on.

The spokeswoman said nobody appeared to be injured in the accident.