Sept. 21 (UPI) -- Officials at London's Heathrow airport are warning of a second day of delays for travelers after a cyber attack disabled a passenger check-in and baggage system.
The problem resulted in hundreds of delayed flights at several European airports on Saturday and left workers using pen and paper to check passengers in for their flights.
At least 90% of the 350 scheduled departures at Heathrow had been delayed, most by at least 15 minutes. Six had been delayed as of Sunday afternoon, according to Flightradar24, which tracks air traffic. Thirteen flights were canceled on Saturday, but most of the hundreds of scheduled flights were delayed.
A Heathrow spokesperson said the "underlying problem was outside our influence" and added that the airport brought on additional staff to help manage the situation.
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