"The decision was made due to security concerns," DG Civil Aviation said, during his briefing on Thursday.On October 7 , four unidentified men opened fire on a passenger plane at Peshawar airport. The firing took place around 4:30am in the morning and no casualty or loss of life was reported.Earlier, Emirates and Etihad halted operations at the Bacha Khan following an attack on a Pakistan International Airlines airplane on June 25 . A female passenger was killed and two crew members were injured in the attack.However, Emirates resumed operations soon at the airport but Etihad still has not.