Three police personnel and 85 Islamic State (IS) fighters were killed following clashes in Afghanistan's eastern province of Nangarhar.The IS fighters attacked several security checkpoints in Achin district of Nangarhar on Sunday, Xinhua news agency reported."Three Afghan Border Police personnel were killed and eight were wounded while 85 IS militants were killed following the fierce clashes and the ensuing airstrikes in the district near the border with Pakistan," a provincial security source said.The IS fighters captured two security check posts after the clashes but police recaptured them after heavy fighting.This is the first time that IS fighters engaged with Afghan security forces since they made gains in the province.