Officials say a suicide bomb attack on a gathering of religious scholars in the Afghan capital, Kabul, has killed at least 43 people.
At least 83 people were also wounded as the clerics met at the Uranus wedding hall, a large banqueting complex near the airport, to mark the birthday of the Prophet Muhammad.
A spokesman for Kabul police, Basir Mujahid said that “Islamic scholars and their followers had gathered to recite verses from the holy Koran to observe the Eid Milad-un-Nabi festival”.
The suicide bomber gained entry and headed for the centre of the gathering, where he detonated his explosives.
Afghan President, Ashraf Ghani condemned the “terrorist attack”.
He declared Wednesday a day of national mourning, with the flag to be flown at half mast.
It is one of the deadliest attacks in Kabul in recent months.
No-one has yet admitted responsibility for the blast.