U.S. Customs and Border Protection said late Wednesday that the computer system used to process international travelers at airports across the country were knocked offline for approximately 90 minutes.
The outage sparked widespread complaints on social media as customers complained of long lines at major airports in New York, Boston, Los Angeles, Atlanta, Dallas-Fort Worth and other ports of entry into the U.S.
It was not immediately clear what caused the outage, but Customs and Border Protection spokesman Mike Friel said there was no indication the glitch was "malicious in nature."
Friel added that CBP agents processed international travelers using "alternative procedures" until the systems were back online. He did not elaborate.
The Associated Press contributed to this report.