Passengers arriving at Heathrow Airport and other UK airports faced significant delays at immigration checkpoints due to a nationwide computer outage experienced by the Border Force. The issue also impacted Manchester Airport, Gatwick Airport, and Belfast International Airport. The problem originated with the Border Force's eGates, causing long lines and delays for arriving passengers. While airports reported no flight disruptions, efforts were made to assist affected passengers. The cause and duration of the outage were unclear, and the UK's Home Office, responsible for the Border Force, did not immediately provide details. Social media images depicted crowded and stagnant lines at Heathrow Airport's immigration gates.