Travelers entering the US from overseas posted photos on social media of long lines at John F. Kennedy International Airport in NY and at Hartsfield-Jackson Atlanta International Airport.
For roughly two hours, the customs computer systems were unable to recognize who was a USA citizen, a resident or a visitor, so everyone had to go through an immigration officer, making the process much longer.
Approximately 2,000 passengers were stuck in line at Miami International Airport, where this video was filmed. DFW International was one of the airports affected.
"The kiosk machines shut down", Martin said.
Other passengers experienced similar problems.
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"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. "CBP officers continued to process worldwide travelers using alternative procedures at affected airports". It said Monday night that all airports were back on line. "Travellers at some ports of entry experienced longer than usual wait times as CBP officers processed travellers as quickly as possible while maintaining the highest levels of security", it said in a statement.
Making the situation worse is that Monday was a busy day, with a lot of people returning home from the holiday. "Seems like there's some insane, end of the world thing going on".
"At this time, there is no indication the service disruption was malicious in nature", the agency said.
Customs officers still had security to national security databases, Garbis said.