WASHINGTON: A humanitarian ceasefire will take effect Monday morning in the fighting between Armenia and Azerbaijan over the mountainous enclave of Nagorno-Karabakh, a joint statement from the US State Department and the two governments said on Sunday. In a separate statement, the OSCE Minsk Group, formed to mediate the conflict and led by France, Russia and the United States, said its co-chairs and foreign ministers would meet again on October 29 to discuss the Nagorno-Karabakh issue.