At least eight extremists were gunned down and 11 others injured, as fierce clash erupted between tribal Lashkar and militants in Mohmand Agency, reported a private TV channel on Monday. 'Eight extremists were killed during a clash with tribal Lashkar in Mohmand Agency, sources said. According to officials, a group of armed militants attacked members of the Qaumi Lashkar in an area of Ambar tehsil. Lashkar sources said that militants had ambushed their people. In retaliation, the lashkar also opened fire and gunned down eight militants and injured 11 others. Militants from Bajaur often cross into Mohmand for attacks, sources said. Lashkar volunteers had demolished dozens of houses of militants some days back.