Traveler with Knife 'Artfully Concealed' in Shoe Detained at Detroit Airport

A traveler was detained and arrested after a knife was found “artfully concealed” in the lining of in his shoe during routine screening Sunday at the Detroit Metropolitan Airport.

The passenger, whose name has not been released, was taken into custody by airport police, the Detroit Free Press reports. The knife, which the Transportation Security Administration says should have been checked, was taken into custody.

“TSA takes the discovery of prohibited items seriously and urges all passengers to check the contents of their bags before leaving home to ensure they are not bringing any prohibited items to the airport,” TSA spokesman Michael McCarthy said in a media release. “Every time TSA discovers artfully concealed prohibited items in a bag at the checkpoint it delays the screening process for all travelers at the checkpoint.”

The discovery occurred as TSA agents at airports where international flights arrive and depart were asked to step up security after U.S. intelligence concerns that Al Qaeda may have a bomb that can pass  undetected through screening, Fox News reports.

The network said that though there has been no evidence establishing such a bomb has been created or a specific threat to the United States.

In an interview on “Meet the Press” Sunday, Homeland Security Secretary Jeh Johnson said U.S. officials continue to evaluate screening at domestic airports, but declined to comment on whether enhanced procedures overseas will be implemented at domestic airports.

"The screening we have right domestically from one domestic airport to another is pretty robust, as the American traveling public knows,” Johnson said. “In this instance, we felt that it was important to crank it up some at the last point of departure airports and we'll continually evaluate the situation."