U.S. immigration authorities are detaining European travelers, weighing on tourism

Some Europeans are becoming leery of visiting the U.S., as reports of U.S. immigration authorities detaining them while traveling, for reasons that are not clear, swirl. 

A number of tourists from Europe say they have been stopped at U.S. border crossings and held at U.S. immigration detention facilities for weeks, despite holding tourist permits, work visas, or otherwise believing that they are authorized to travel to the U.S.

A backpacker from Wales was detained at the Canadian border for close to three weeks, before being permitted to fly home. A Canadian woman with a work visa was detained for 12 days at the Tijuana border, before returning to Canada.