WASHINGTON — Two men on a United Airlines flight from Chicago to Amsterdam were questioned by Dutch authorities after U.S. officials found a cell phone taped to a Pepto Bismol bottle and a knife and boxcutter in checked luggage connected with the men, a law enforcement official said.

The official identified the men as Ahmed Mohamed Nasser al Soofi and Hezam al Murisi. Al Soofi had a Michigan address, the official said.

ABC News, which first reported the incident Monday, said al Soofi was from Detroit and that both he and al Murisi were charged in the Netherlands with “preparation of a terrorist attack.” U.S. officials would not confirm that.

The official said Al Soofi was questioned as he went through security in Birmingham, Ala., on his way to Chicago, the official said. He told Transportation Security Administration authorities he was carrying a lot of cash, the official said. Screeners found $7,000 on him.

Al Soofi was supposed to fly from Chicago to Washington Dulles International Airport in Virginia, and then on to Amsterdam, the official said. But when he got to Chicago, he changed his travel plans to take a direct flight from Chicago to Amsterdam. Al Murisi also changed his travel plans in Chicago to take a direct flight to Amsterdam, raising suspicion among U.S. officials.

Homeland Security spokeswoman Amy Kudwa said once officials found suspicious items in luggage associated with two passengers on Sunday night’s flight, they notified Dutch authorities.