An Afghan official says there are no plans to revive a peace process aimed at bringing the Taliban to the negotiating table. Haroon Chakhansuri, Afghan President Ashraf Ghani's spokesman, says a four-nation group comprising Afghanistan, Pakistan, China and the United States has no plans to meet again after previous rounds of meetings produced no results. Chakhansuri says "there is no set time" for another meeting of the group. The group has met five times since January, in Kabul and Pakistan. The meetings did not include the Taliban, who have refused to join peace talks. Ghani has accused Pakistan of harbouring Taliban leaders - an accusation that Islamabad denies. Chakhansuri also said that Afghanistan continues to suffer from "terrorist groups that operate from and have a support base in Pakistan."