The cause of a bus fire that closed Melbourne’s West Gate Bridge, playing havoc with rush hour traffic, is yet to be determined.

Police said the bus caught fire on the freeway about 5.45pm on Monday, forcing all lanes to be closed.

Two lanes re-opened just before 7pm but emergency services remained on the bridge amid continuing delays.

A bus has burst into flames, causing traffic havoc on Melbourne’s West Gate Bridge. (Nine)
Police said the bus caught fire on the freeway shortly before 6pm on Monday. (Nine)

By midnight, the incident was no longer listed on the VicRoads traffic website.

A Victoria Police spokesperson said no one was injured and the fire was not being treated as suspicious.

Fire Rescue Victoria said crews extinguished the fire by 6.20pm, within 20 minutes of arrival.

The cause of the fire has not yet been determined.

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