The technological failure was caused by an apparent computer outage affecting passport control, with travelers reporting that kiosk machines at customs were not working.
Computers on immigration desk at various airports of the United States went down for about two hours on Monday, because of long lines for the people entering in the United States after year-end holidays.
Worldwide travelers returning to the US on New Year's Day faced massive frustration nationwide as the computer systems operated by Customs and Border Protection failed. That power outage was caused by a fire that broke out beneath the airport, officials said.
Other passengers experienced similar problems.
"Just landed back in the U.S. and I'm stuck in the customs line because the border patrol servers are down nationwide", wrote Pearse Adams.
While Customs said its systems were restored by about 10 p.m., airports warned passengers to expect delays tonight. All airports are now back on line. CBP officers continued to process global travelers using alternative procedures at affected airports. Acting Port Director Carlos Rodriguez of Hidalgo/Pharr/Anzalduas Port of Entry said CBP officers "continue to make significant narcotic seizures by combining their experience with the use of technology and other available tools to accomplish the CBP mission".
Security remained the priority during the outage.
The agency said it had access to the national security-related databases during the outage.
US Customs and Border Protection said on its Twitter page that there was "no indication the disruption was malicious in nature".
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