LONDON >> Travelers arriving in the U.K. faced hourslong delays Saturday after a technical problem shut electronic border gates at airports across the country, forcing everyone to have their passports checked manually on what was expected to be one of the busiest travel weekends of the year.

The Home Office, the government agency responsible for immigration and borders, said it was working to correct a “nationwide border system issue,” though it provided no details about what caused the problem.

Airport operators asked for patience and apologized for the delays as frustrated travelers took to social media to post photos of long lines at airports including Manchester in the north of England and London Heathrow, Europe’s busiest airport. Travel is expected to be especially busy over the next few days as a three-day weekend coincides with the start of a weeklong holiday for most schools in Britain.

— The Associated Press