IRNA Explosion of ammunition killed 20 members of Taliban and injured 16 others in Nangarhar Province, eastern Afghanistan.
The accident happened when a group of civilians, governmental officials and members of Taliban gathered to celebrate Eid al-Fitr, Nangarhar Governor Ataollah Khogiani said.
Based on some unofficial media, the accident was a terrorist attack.
The officials announced that the blast caused by a rocket inside a Taliban car.
Taliban has not yet claimed any responsibility.
This is while Afghan President Ashraf Ghani in a message declared a nine-day ceasefire in the country called for in a fatwa issued by Afghan ulema.
The Government of the Islamic Republic of Afghanistan announces ceasefire from the 27th of Ramadan until the fifth day of Eid-ul-Fitr following the historic ruling [Fatwa] of the Afghan Ulema, he said.