KOHAT: Three militants were killed in a roadside explosion in Kharmatang area in Darra Adamkhel on Monday, tribal sources said.The sources said that three militants of the Tariq Afridi-led Tehrik-e-Taliban Pakistan (TTP) group, Azmat, Zakir and Muhammad Said, were travelling in a jeep in Kharmatang area bordering Khyber Agency when a roadside blast was carried out by the militants of the rival Momin Afridi group. All three died on the spot.Following the incident, both the groups exchanged heavy gunfire but there was no report about further casualty. The bodies of the militants were still lying on the spot.