At least one explosion has been heard outside Istanbul’s Besiktas sports stadium, Turkish media and witnesses say.
There are reports of several people wounded, in what appears to have been an attack on riot police.
Ambulances and police were seen rushing to the scene, and TV footage showed a fire burning outside the stadium.
Turkey has seen a recent spate of militant attacks in major cities that have left dozens of people dead.
The blast on Saturday happened two hours after a football match between Besiktas and Bursaspor, two of Turkey’s top teams, ended. Local media reported that fans had already dispersed.
Interior Minister Suleyman Soylu said at least 20 people had been injured. Suleyman Soylu said it was thought a car bomb had specifically targeted riot police.
Witnesses heard gunfire after the attack, and ambulances and police vehicles rushed to the scene.
Turkey has seen a recent spate of militant attacks in major cities that have left dozens of people dead.
No group has said it was behind the attack but a wave of bombings in Turkey this year has been carried out by Kurdish militants and so-called Islamic State, the BBC’s Turkey correspondent, Mark Lowen, reports.
The fact that police appear to have been hit will focus suspicion on Kurdish guerrilla groups, who have mainly targeted the security forces, he adds.
Transport Minister Ahmet Arslan wrote on Twitter that it was a terror attack.
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