U.S. officials are investigating whether two men arrested in Amsterdam were conducting a dry run for a potential terrorist attack.
One official said the two were arrested after landing in the Netherlands on United Airlines flight from Chicago to Amsterdam after suspicious items were found in their checked luggage.
Some of the items found were a cell phone taped to a Pepto Bismol bottle and a knife and box cutter.
Authorities said one of the men was supposed to fly from Chicago to Virginia then oversees but changed plans last minute raising suspicion among U.S. officials.
The investigation is focused on a 48-year-old Yemeni native who is a permanent resident in the U.S.