Parachinar, Pakistan, April 04, 2010, SPA _ A Pakistani government official says security forces repulsed a militant attack against an army checkpoint in a northwestern tribal region and killed 21 insurgents. Samiullah Khan, a senior government administrator in the Orakzai region, says troops and artillery successfully defended the checkpoint, according to a report of the Associated Press. --SPA 10:51 LOCAL TIME 07:51 GMT www.spa.gov.sa/765777