Three passengers sustained injuries when unknown armed men opened fire on a bus in lower Kurram Agency on Tuesday. A bus carrying 20 passengers from Parachinar to Peshawar was attacked by unidentified militants with rockets and automatic weapons at Parao area at Chapri locality of the agency. The armed men first fired rockets that did not explode. Later, they opened indiscriminate fire on the bus. Resultantly, three passengers who were identified as Kazim Hussain, Munir Hussain and Arif Hussain sustained multiple injuries.