Afghan President Hamid Karzai is calling the United States’ refusal to hand over an undisclosed number of detainees a breach of an agreement that outlines the transfer of power from US forces to Afghanistan, according to CNN. Karzai’s accusation comes two months after the United States handed over Parwan prison at Bagram Air Base. The handover of the prison and detainees was considered the linchpin in a larger agreement that spells out US-Afghan relations following the withdrawal of American troops in 2014. In a statement released Monday, Karzai called the failure to hand over all the detainees “a serious breach of the Memorandum of Understanding.” He ordered his defense minister, attorney general and prison administrator “to take required and urgent measures” to ensure the complete transfer of authority. The issue has become a sticking point between Karzai and US military leaders.