An Afghan official says the government will finalize a peace deal with a notorious militant insurgent group within days.

Ataul Rahman Saleem, deputy head of Kabul's High Peace Council, said on Saturday an agreement with the armed wing of Hezb-i-Islami could be completed Sunday, after two years of negotiations.

A senior representative of the group, Amin Karim, also says he expects President Ashraf Ghani to approve the deal Sunday.

The deal would mark a breakthrough for Ghani, who has so far failed to end the 15-year war with the Taliban.

Hezb-i-Islami is led by warlord Gulbuddin Hekmatyar, best known for killing thousands of people in Kabul during the 1992-1996 civil war.

He is believed to be in Pakistan. Completion of the 25-point agreement could see him soon return to Kabul.