In a post on social media, the airport said police are "currently on-site dealing with an incident".

"Airport operations are currently suspended," it added.

"Passengers are advised to NOT come to the airport at this time."

Some commented on the airport's social media page to say they or their family members were stuck on grounded planes, while one person described the area outside the airport as "chaos".

A spokesman for West Midlands Police said: "Birmingham Airport is currently being evacuated following a report of a suspicious vehicle.

"This is a precautionary measure to ensure the safety of passengers and staff."

The force warned passengers with flights this afternoon to contact their airline and check the airport's website for updates.

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National Express West Midlands said bus services are unable to stop at terminals or the international station.

Birmingham Airport is the UK's seventh-busiest hub, with 11.5 million passengers alone last year.