American law enforcement officials say their initial concerns about a possible terror “dry run” involving two men on a United Airlines flight to Amsterdam have eased, in part because they have learned the men’s abrupt change in flights resulted from them missing their original flight.

“These two passengers have not been charged with any crime in the United States and we caution you against jumping to any conclusions,” said a statement issued by the Department of Homeland Security Tuesday afternoon. The two men, both from Yemen, remain in Dutch custody following what authorities in the Netherlands said was the result of “information provided by the US authorities.”

They are identified by US authorities as Ahmed Mohamed Nasser al Soofi and Hezam al Murisi. Al Soofi began his trip in Birmingham, Alabama and al Murisi started from Memphis, Tennessee.