On Monday, a United States Customs and Border Protection (CBP) computer outage which lasted around four hours resulted in long lines and delays at several airports across the country.

The outage impacted inbound international travelers the most, which were forced to wait at customs screening stations for hours.

According to Reuters.com, the CBP computer outage started at around 5 p.m. ET and last through 9 p.m. ET, but all airports which reported problems are now back online. Airports in New York, Los Angeles, Miami, Boston and Atlanta were impacted.

“At this time, there is no indication the service disruption was malicious in nature,” CBP spokeswoman Jennifer Evanitsky said in a statement. “During the technology disruption, CBP had access to national security-related databases and all travelers were screened according to security standards.”

The Associated Press shared a video on YouTube from inside Miami International Airport during the computer outage:

Several travelers also posted videos from inside delayed airports on Twitter:

US Customs is down and this is the back of the line Atlanta #atl pic.twitter.com/RHcB8Fh4HF

— Darrellkc (@hamptonsunset) January 2, 2017

@cnnbrk please let US Customs know the Miami airport could use a little help. Thousands of us waiting in a "line". pic.twitter.com/VGLUOUiaoP

— Garret Prather (@garretp) January 3, 2017

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