Bagram Airfield attack
The Taliban has claimed responsibility for an attack on the largest US military base that killed at least four people and injured 14 others early Saturday, the NATO mission there said.
An explosive device was detonated at Bagram Airfield, north of Kabul.
The attack had been planned for months, a Taliban spokesman told CNN.
The Taliban claimed responsibility in a tweet praising the "strong attack" on Bagram Airfield.
In a statement, Taliban spokesman Zabihullah Mujahid said a suicide bomber had targeted "a sports ground where more than 100 military officers, important people and soldiers were busy exercising."
"To the family and friends of those who lost their lives today, we share your loss and our thoughts are with you. We offer you our deepest condolences," said US Army Gen. John W. Nicholson, head of NATO and US forces in Afghanistan.
NATO Secretary General Jens Stoltenberg offered his support on Twitter to those affected by the attack and said the alliance stood with Afghanistan in the fight against terror.
"My thoughts go to the loved ones of those killed at #Bagram Airfield & the wounded."