Army extended its offensive against militants in mountains along the Afghan border on Friday, killing at least nine insurgents, military officials said. The army launched the offensive in the region known as the Khyber agency this week targeting Islamists holed up in remote mountain hideouts on the border. The offensive, code-named "Khyber One", comes against the backdrop of a broader military operation in the lawless North Waziristan region south of Khyber, where the army has been battling to contain the insurgency since June.