At least four security men were wounded when an explosion rocked the Hayatabad area in Pakistan's Peshawar on Wednesday. Police said that the explosion occurred at Hayatabad phase-III Chowk, when a vehicle of Khasadar force was passing by. The targeted vehicle hit by the blast wounded four security men, Pakistan's (Geo News) reported. The injured were shifted to Khayber Teaching Hospital and Hayatabad Medical Complex. Bomb disposal unit has arrived at the scene of incident and the nature of the blast was being ascertained.