Eight policemen were killed as a roadside bomb struck a police van in Jauzjan province, 390 km north of Afghan capital city Kabul on Thursday, a private television channel reported. "The gruesome incident happened in Faizabad district today when a police vehicle ran over a mine," Tolo television aired in its news bulletin. Anti-government militants had planted the mine, the television quoted police spokesman in northern region Lal Mohammad Ahmadzai as saying. Taliban militants fighting Afghan and NATO-led troops stationed in Afghanistan have intensified their activities since launching spring offensive in May 1.