So-called Islamic State has reportedly released an audio message from its leader Abu Bakr al-Baghdadi.
In the purported recording al-Baghdadi, said he is "confident of victory" and calls on the people of Mosul to fight the "enemies of God".
In the purported recording he also calls on his followers to attack Turkey, calling the country the "ally of the atheists".
He also reportedly calls on suicide fighters to to "turn the nights of the unbelievers into days, to wreck havoc in their land and make their blood flow as rivers."
If confirmed to be a new recording, it would be the first he has made in almost a year.
It is thought to be a response from the terror group to claims that their leader has been killed or surrounded in Mosul.
US-backed Iraqi government forces are engaged in an operation to recapture Mosul from the militants.