Iran and the United States have not discussed extending their ceasefire, a senior Iranian official told Reuters on Wednesday. The official disputed a report that Tehran and Washington had agreed to extend a 60-day ceasefire under their June interim agreement. Read more: Pakistan emerges as key mediator in easing US-Iran tensionsThe Iranian source said Tehran does not consider the ceasefire period as having started. The interim agreement called for an immediate and permanent end to military operations. Meanwhile, the Iranian official said mediators were discussing a possible US return to the interim agreement.