Authorities say an airline passenger has been arrested in Michigan after being found with a knife concealed inside the bottom lining of one of his shoes.

The Transportation Security Administration says the knife was found Sunday morning during security screening at Detroit Metropolitan Airport in Romulus.

The TSA says airport police responded, took possession of the knife and arrested the passenger. His name wasn’t immediately released.

The TSA says the knife should have been placed in checked luggage.

(AP)