Afghan President Ashraf Ghani speaks during a news conference in Kabul, Afghanistan July 15, 2018. /Reuters

Afghanistan's President Ashraf Ghani on Monday issued a decree to release the final batch of prisoners demanded by the Taliban as a condition to move to peace talks, sources told Reuters.

"It is signed," a presidential palace source said on Monday evening, a day after a grand assembly recommended Ghani release 400 'hardcore' prisoners so that peace talks could begin in Doha.

The Taliban have said that once the prisoners are released they would start peace talks within a week. This comes after months of delays since the United States signed a troop withdrawal deal in February.

It was not immediately clear when the release would happen.