PESHAWAR - At least 30 worshippers were killed and over 100 others got injured when a powerful bomb exploded inside a mosque in Tirah Valley of Khyber Agency on Thursday. Sources informed that some 150 worshippers were offering Zohr prayers inside the mosque at the time of the explosion. The intensity of the blast was so severe that it damaged a major portion of the mosque. The injured were shifted to Moshti and other nearby hospitals of Hango and Kohat. The mosque was under the control of Lashkar-e-Islam (LI). Soon after the blast, residents of the area rushed towards the site, helped in the rescue activities and retrieved the injured and the dead from the debris. The death toll is feared to rise as most of the injured were stated to be in critical condition. Security forces cordoned off the area and started collecting evidence from the blast site. The dead included an LI militant, however it was not confirmed as the blast occurred in a far-off area. It is worth mentioning here that two militant organisations Ansar-ul-Islam and Lashkar-e-Islam have been engaged in armed clashes since long which have so far claimed thousands of lives. A few months back, a mosque that was under the control of Ansar-ul-Islam was also attacked in the same way. Agencies add: The explosion damaged a mosque and a few shops, killing a militant commander in Dars village of upper Tirah Valley, in what security officials said could be a feud between rival factions. We have confirmed reports that militant commander Azam Khan (of Lashkar-e-Islam) was also killed in the blast, an intelligence officer said. We are still not sure about the nature of the blast, another intelligence officer in Peshawar told AFP by telephone. One regional official said the bomb exploded as about 80 people were gathered around the mosque, a cattle market and bazaar - which local residents said also sold hashish - and near a base of the Lashkar-e-Islam militia. There is a possibility that the rival group attacked the Lashkar-e-Islam base, one intelligence official said. There were conflicting reports from militant sources and local officials over whether it was a suicide blast or planted bomb, but they all agreed that Khan - a village-level commander - was the target. The death toll could rise as many people are still trapped under the rubble, one of the officials in the region told Reuters by telephone.