Islamabad, Aug 16, SPA -- Five Security officials were Monday killed and eleven others injured in an attack by unidentified persons near Pakistan's biggest natural gas field in the Balochistan province, police said. They said that the personnel of the paramilitary Frontier Constabulary were escorting the employees of the Pakistan Petroleum Limited (PPL) from Pirkoh to Sui when they came under attack from unknown persons. Four Frontier Constabulary troops were killed near old Sui. In another rocket attack on a Pakistan army convoy nearby, a solider was killed, officials said.--SPA1339 Local Time 1039 GMT www.spa.gov.sa/192356