A Pakistani border security guard stands alert at Pakistan-Afghanistan border post, Chaman in Pakistan, Friday, May 5, 2017. Backed by artillery, Afghan security forces fired across the border on Pakistani census workers and troops escorting them on Friday, killing many people and drawing a response from the military, Pakistan said. On the Afghan side, officials reported that scores of people killed in the incident, a significant escalation of hostilities between the two neighbours. (Photo by Matiullah Achakzai/AP Photo)
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