Immediately after the terrorist attacks against New York and Washington, D.C., on 11 September 2001, NATO invoked Article V of the treaty and deployed NATO early warning aircraft to help monitor the skies over North America. EUCOM provided major forces for subsequent operations in Afghanistan and stepped up its efforts to protect United States interests in Europe and Africa. Subsequent terrorist attacks in the EUCOM theater in Casablanca, Madrid, London and Algiers prompted EUCOM to launch Operation Enduring Freedom Trans-Sahara in 2007 while continuing to provide rotational forces to Afghanistan and Iraq.