The Adana massacre occurred in the Adana vilayet of the Ottoman Empire in April 1909. Many Armenians were slain by Ottoman Muslims in the city of Adana as the Ottoman countercoup of 1909 triggered a series of pogroms throughout the province. Between 20,000 and 30,000 ethnic Armenians and 1,300 Assyrians were killed and tortured in Adana and the surrounding towns. Unlike the previous Hamidian massacres, the events were not officially organized by the central government, but culturally instigated via local officials, Islamic clerics, and supporters of the Committee of Union and Progress (CUP).