HANGU   -  At least five militants were killed in a clash with security forces when they attacked a checkpost here on Tuesday morning. According to security sources, militants fired two missiles on a FC checkpost located in Dhand area, tehsil Tal of Hangu partially damaging it.The FC troops retaliated with full force, killing five extremists and forcing others to flee. Later, a search operation was launched in the area to nab the militants but no arrest could be made.