The attack coincided with the start of the Heart of Asia regional security conference in Islamabad
No group has claimed responsibility but Taliban insurgents frequently carry out suicide and roadside bombings across the country.
In a statement on its website Wednesday the Taliban claimed it had shot the helicopter down.
The Taliban indicated they would not stand in the way of aid efforts and ordered fighters to help victims.
Under the new plan, troops will be drawn down to 5,500 starting sometime in 2017 and based at four locations - Kabul,...
The Taliban said the decision to move out of Kunduz city was not a sign of defeat.
The U.N. human rights chief said the bombing could amount to a war crime
Interior Minister spokesman Sediq Sediqqi said on Twitter: "It is retaken and being cleared from terrorists, heavy casualty to the enemy....
Taliban claimed that American forces are involved in this fight