The firing took place around 4:30 am this morning, according to sources in the police. No casualty or loss of life was reported till the filing of this report.The sources also said that the four men, in possession of machine guns as well as hand grenades, fired at the plane in the Suleman Khel area at the time of landing.It was reported that the pilot managed to land the plane successfully and security forces have started a search operation following the attack.SSP Operations, however, has said that reports of firing on the plane are not true.This is the fourth such attack in Peshawar in the last few months.On September 27, a Pakistan International Airlines (PIA) aircraft was fired upon during landing at Bacha Khan International Airport in Peshawar. However, there were no casualties.On September 1, a Russian cargo plane came under fire in the Sheikh Muhammadi area of Badhaber, while in June this year, a PIA flight PK-756 was fired upon in a similar fashion in the same area. One woman was killed and two persons were injured in the attack.