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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A NATO official in Afghanistan confirmed there was an attack in the border area close to the Upper Orakzai region, but gave no further details saying the incident was being investigated.

一名在阿富汗的北约官员证实在奥拉克赛地区附近的边界地区发生了袭击，但没有透露进一步的细节，说是事件正在调查中。

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

BBC: Abducted Pakistan paramilitary troops found shot dead

Members of the Zakhakhel tribe had been travelling from Tirah valley in Khyber district to Peshawar when they were caught in the blasts in Orakzai.

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

An Orakzai administration official told the BBC there had been two bombs and that two passenger vans had been targeted near the village of Hasanzai.

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