In Pakistan, at least four policemen were killed today when their vehicle came under attack from unidentified terrorists in restive northwestern Khyber Pakhtunkhwa province. <br/><br/>The policemen were returning from an operation in Kamal Khel area of Kohat district when terrorists ambushed their vehicle. According to the Police, a Station House Officer (SHO), an additional SHO and two constables died in the firing. <br/><br/>The police have cordoned off the entire area and started a search operation in Lachi tehsil to nab the attackers.