Islamabad, Rajab 24, 1436, May 13, 2015, SPA -- Four soldiers from elements of Pakistani paramilitary troops were killed in an attack by unidentified gunmen on Tuesday evening on a military patrol in the city of Dera Ismail Khan in northwest Pakistan. Security sources said that gunmen fired barrage of bullets from a machine gun on a patrol vehicle of paramilitary forces and escaped from the site. --SPA 01:52 LOCAL TIME 22:52 GMT www.spa.gov.sa/w