The Kandahar authorities detained four Pakistanis on suspicion of helping insurgents build bombs, an intelligence official said. “On a tip-off we captured four Pakistanis who are experts in making suicide-bombing vests and remote-controlled bombs,” Abdul Qayoum Katawazi told AFP. He would not provide further details, citing an ongoing investigation. Roadside bombs and Iraq-style suicide explosions have become key tactics for Taliban militants, who have intensified their attacks as part of a bloody insurgency they are waging against the government in Kabul.