Islamic State leader Abu Bakr al-Baghdadi told his followers to fight to the death in what he said was a war against Shi'ite Islam, Western "crusaders" and the Sunni "apostate" countries Turkey and Saudi Arabia.
Expressing confidence in victory Abu Bakr al-Baghdadi called on the jihadists to "wreak havoc".
He also urged them to target Turkey and Saudi Arabia, Sunni Muslim regional powers he said had entered the war against Islamic State, Reuters reports.
Islamic State fighters should "unleash the fire of their anger" on Turkish troops fighting them in Syria, and take the battle into Turkey.
"Turkey entered the zone of your operations, so attack it, destroy its security, and sow horror within it. Put it on your list of battlefields. Turkey entered the war with the Islamic State with cover and protection from Crusader jets," he said referring to the U.S.-led air coalition.