United Airlines resumed flights on Tuesday afternoon shortly after a reported computer glitch halted all of the airline’s flights nationwide for roughly an hour. The airline said in a statement that “a software update caused a widespread slowdown in United's technology systems.” The statement noted that the issue had not involved a security breach. The Federal Aviation Administration had initially announced the ground stop early Tuesday afternoon, without providing further details. The stoppage delayed about 211 flights nationwide, according to ABC News. The issue did not impact flights that were already in the air.