Turkey is working on a military operation in northern Syria, everything can happen suddenly, said President Tayyip Erdogan.

"I have a statement on this subject: we can come suddenly one night. No need to fuss. No need to rush," he said.

"We are already working in this area right now. We have operations in northern Iraq on the one hand, and operations in Afrin, northern Syria, and so on, on the other hand... If we show a little patience, I hope we will carry out operations in the most powerful way when the time," Erdogan told reporters on the plane upon his return from Madrid.