ISLAMABAD: Police have failed to unravel the mystery of killing of a 22 years old student close to gate of Sultana Foundation during firing by some unknown persons. Police have even failed to obtain footage of CCTV cameras installed at the main gate of Sultana Foundation. Sources said that one Muhammad Mehdi 22 was on its way to his residence located in Ali Pur Farash along with his cousin on a bike. All of a sudden some unknown persons opened firing on them near main gate of Sultana Foundation. Muhammad Mehdi was fatally injured in the firing and was immediately shifted to local hospital. However he breathed his last due to profuse bleeding. Shahzad Town police have registered case of this incident under No 302/34 but police have not reached any conclusion so far.