Turkish planes have for the first time carried out air strikes against Islamic State (IS) group targets in Syria.
Police also launched raids against IS and Kurdish militants across the country, arresting 251 people, the Prime Minister's office said.
On Thursday, Turkish forces exchanged fire with IS fighters near the Syrian border. One Turkish soldier was killed.
Turkey will now let the US launch air strikes against IS from the Incirlik air base, US officials have said.
The raids in Istanbul, where 140 properties were searched, involved 5,000 officers. READ MORE OF THIS STORY