PESHAWAR- The initial investigation report regarding the attack on Pakistan International Airlines (PIA) plane at Peshawar airport on Friday revealed the involvement of banned Tehrik-e-Taliban Pakistan (TTP) Shahid group in the incident. According to the contents of the report prepared by the police authorities, foreign made M-16 gun was used by the TTP terrorists to fire on the PIA flight no. PK-756 when it was about to land at the Bacha Khan International Airport, Peshawar. The flight was arriving from Riyadh with 160 passengers on board at the time of attack. The investigating team has found 24 spent shells of the foreign made gun from Mashu Khel and Suleman Khel areas of Peshawar during the post attack search in the adjoining areas. Police also arrested some suspected persons, however, the details about the arrests were not made public. Witnesses told that there were 8 to 10 militants who opened fire on the aircraft at the time of landing. After the attack, the number of joint checks posts of police and other security forces has been increased in the adjoining areas of Khyber Agency including Mashu Khel, Suleman Khel and Faqirabad. It is pertinent to mention that a woman passenger was killed and two flight stewards were wounded when a passenger flight of PIA came under attack while landing at the Bacha Khan International Airport in Peshawar on Tuesday night. The flight No. PK-756 was about to land in Peshawar when unidentified attackers opened fire on the aircraft.