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An Afghan security force member stands at the site of a car bomb attack in Kabul on May 31, 2017.
At least 40 people were killed or wounded on May 31 as a massive blast ripped through Kabul's diplomatic quarter, shattering the morning rush hour and bringing carnage to the streets of the Afghan capital. / AFP PHOTO / SHAH MARAI        (Photo credit should read SHAH MARAI/AFP/Getty Images)
An Afghan security force member stands at the site of a car bomb attack in Kabul on May 31, 2017.
At least 40 people were killed or wounded on May 31 as a massive blast ripped through Kabul's diplomatic quarter, shattering the morning rush hour and bringing carnage to the streets of the Afghan capital. / AFP PHOTO / SHAH MARAI        (Photo credit should read SHAH MARAI/AFP/Getty Images)

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    What is going on in Afghanistan?

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What is going on in Afghanistan?

Afghanistan continues to be blighted by violence. CNN's Nic Robertson explains who is responsible for these attacks and why.

What is going on in Afghanistan?

Afghanistan continues to be blighted by violence. CNN's Nic Robertson explains who is responsible for these attacks and why.