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The 62-year-old suspect is alleged to have accidently passed through the security area through a door next to a supermarket in the terminal.

A police spokeswoman told media: "He just picked the wrong route. He was trying to get to his aircraft as quickly as possible."

German media have described the man – reportedly Spanish – as a man wearing red trousers, pink shirt and understood to have a bald patch.

At least five outbound flights and 2,500 people have been delayed because of the incident, police say.

According to local reports, all planes returned to the terminal building after the alert.

(Image: REUTERS)

Passengers are reported to have been forced to remain inside while the planes remain grounded.

A search with sniffer dogs across the airport is now underway.

Terminal 1 has been cleared meaning everyone will have to be checked again by security when the evacuation is over.

Police checked everyone's ID cards during the evacuation.