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Afghan security forces arrive at the site of an attack in Kabul

Afghan police stand guard at the site of an attack as a NATO helicopter flies overhead in Kabul

Afghans gather near the site of an attack in Kabul

Smoke billows from the site of an attack at the main international airport in Kabul

Afghan police arrive at the site of an attack in Kabul

Afghan security forces arrive at the site of an attack in Kabul

Afghan security forces arrive at the site of an attack in Kabul

Afghan security forces take their position at the site of an attack in Kabul