A two-hour outage in U.S. Customs and Border Protection's processing systems caused delays at some of the nation's biggest airports on New Year's Day.
The system went down at about 7:30 p.m. and came back online at about 9:30 p.m., customs and border protection spokeswoman Jennifer Gabris said.
It's a rough night for worldwide travelers at Miami global Airport.
On the first day of the new year, long lines of passengers entering the United States halted at global airports in New York, Florida, Texas and California.
CBP said "there is no indication the service disruption was malicious in nature". Several other airports said they were affected.
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Kennedy Airport and Dallas/Fort Worth International Airport also acknowledged there could be passenger delays.
Travelers entering the USA have been growing increasingly frustrated at long security queues as immigration desk computers at various United States airports shut down for about two hours on Monday, media reports have said.
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.
Customs says that passengers continued to be processed during the outage, "using alternative procedures at affected airports".
According to the CBS News, there were up to 2,000 passengers stuck in lines at the Miami International Airport. All airports are now back on line.