KOHAT - An SHO was killed and two cops sustained injuries in exchange of fire between a police party and militants here on Sunday. According to details, the exchange of firing took place at Kohat Highway in which one militant was also killed while others managed to flee.  The injured police personnel were shifted to nearby hospital where their condition was stated to be out of danger. Police have beefed up security at the entry and exit points of the city and started search for the militants.