At least 18 people were killed and several others injured in a deadly blast inside a passenger coach on Hangu- Kohat Road here on Monday, DIG Kohat Masood Afridi said. He told media persons that the blast occurred on Hangu-Kohat Road near Jozara, border area of Hangu and Kohat district inside passenger van coming from Hangu, resultantly killing 18 persons instantly while several others injured.The DIG said the investigation was underway to ascertain nature of explosion. However, he said apparently it was cylinder blast as evidence of suicide attacks or bomb blast was not found from place of explosion. District Police Officer (DPO) Hangu Abdur Rashid said that a gas cylinder in the van blasted after another flying coach collided with the ill-fated van from the backside. The passengers of the other flying coach also injured.The injured were transferred to nearby hospital. Security forces soon after the incident cordoned-off the area and started operations.The dead identified are Nasir Khan son of Khan Muhammad, Kamil Shah residents of Hangu, Gul Maan Shah son of Lal Badshah resident of Orakzai Agency, Badshah Mir son of Akhtar Gul resident of Kurram Agency, Zulfiqar Ali son of Dalayar Ali resident of Hangu, Hazrat Noor son of Jan Muhammad resident of Afghanistna, Iqrar Ali son Syed Shah Jehan and Muhammad Ghani son of Fazal Manan resident of Hangu while the identity of other victims could not immediately ascertained due to their burnt bodies.The injured are Hazrat Noor, Kamran, Janan, Tahir Muhammad, Raqeeb Khan, Zaman Khan, Muhammad Razak, Tala Muhammad, Inamullha Khan and Muhammad Tafil. The condition of several victims was stated to be critical and doctors on leave have been called in for duty.