Pakistani officials differed on the exact location of the incident, saying it either took place in Upper Kurram or Upper Orakzai.

巴基斯坦官员就事件发生的确切位置上说法不一，说它要么发生在上古勒姆或在奥拉克赛。

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In a separate attack on Friday, an explosion killed five people and wounded four in the tribal region of Orakzai in the northwest, officials said.

官方表示，在周五的一次单独袭击中，位于西北边境的奥勒格宰部落地区有5人在爆炸中死亡，4人受伤。

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Meanwhile, groups based in Orakzai-Khyber region are believed to be behind the recent spate of bombings in Peshawar and other cities of central NWFP.

同时，那些根据地在奥拉·克兹-开米尔地区的团伙被认定是最近白沙瓦及其他西北前线省城市爆炸潮的幕后实行者。

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The two roadside blasts in Orakzai region came only hours earlier, and left another 26 wounded.

BBC: Attacks in Pakistan's north-west 'kill at least 19'

The men were abducted last month from the Orakzai region after militants attacked a military post.

BBC: Abducted Pakistan paramilitary troops found shot dead

Meanwhile, at least six people were killed in a bomb attack on an anti-Taliban tribe in the Orakzai region.

BBC: Attacks in Pakistan's north-west 'kill at least 19'