Travelers at airports around the country, including JFK, faced massive crowds and delays boarding their flights Friday because of a computer outage that affected the U.S. Customs and Border Protection agency.

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Customs and Border Patrol tweeted at 6:37 p.m. that affected systems were coming back online and travelers were being processed, but not before what it described as a temporary outage involving its processing systems stymied travel.

Airports tweeted earlier in the day that CBP officers had to manually process travelers — Americans as well as foreign visitors. Some travelers tweeted photos and videos of huge lines.

One person with Global Entry at Kennedy Airport told NY1 that they had to wait 90 minutes to get through security, a service that usually gets people through faster. Other travelers reported even longer waits.

The agency didn't precisely describe the breakdown, but the spokeswoman said there was "no indication of any nefarious activity." She said officers were able to access security-related databases and maintain security standards while screening people manually.

Other airports that reported delays at times Friday included Orlando International Airport, Los Angeles International Airport, Hartsfield International in Atlanta, Dallas-Fort Worth International in Texas, and Raleigh-Durham and Charlotte International in North Carolina.

Rebekah Tromble, an associate professor at George Washington University, tweeted a video clip in which she panned over the arrival hall at Dulles International Airport in northern Virginia. She estimated there were at least 5,000 people packed into the hall.

Travelers are urged to check with their flight carrier and the airport to see if their flight is still delayed.

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Information from the Associated Press was used in this report.