Travellers have been delayed at several US airports, due to a computer issue affecting the country’s customs agency.
In a tweet, the US Customs and Border Patrol said, it was experiencing a “temporary outage” with processing systems.
The scale is unclear, but pictures on social media show long queues at airports, in at least four states.
Los Angeles Airport authorities said, customs officers were “processing passengers manually”, as a result of the outage.
Issues with customs checks have also been reported in Seattle, Philadelphia, San Francisco, New York’s John F. Kennedy Airport, and Dulles Airport in the US capital.