Pakistani troops killed a spy chief in Osama bin Laden’s al Qaeda network in a 12-day sweep on its desolate Afghan frontier, an army official said Monday, vowing to step up the hunt for Islamic militants. The army said it would flush foreign fighters from its mountainous tribal territories bordering eastern Afghanistan after a bloody offensive in South Waziristan district ended on Sunday with more than 100 people killed. “The casualties were relatively high but a small cost for the lofty cause of elimination of terrorism from Pakistan society,” military spokesman Maj. Gen. Shaukat Sultan told reporters. He said troops had killed 63 militants, including an al Qaeda intelligence chief whom he identified only as “Mr. Abdullah.” He would not provide further details such as the man’s nationality, full name or how and when he was killed. Full Story