An explosion inside a mosque on the outskirts of the Afghan capital Kabul killed at least 12 people during Friday prayers as worshippers gathered for the Aidilfitri holiday during a ceasefire.

The Taliban insurgent group, which declared the three-day truce for the holiday, condemned the attack in a statement.

The Islamic State claimed responsibility for the attack on Saturday through its Nasheer news agency on Telegram.

Ferdous Faramarz, spokesperson for the Kabul police, said...