Interior Minister Süleyman Soylu has announced there were two separate explosions, one of which is being evaluated as a suicide bomb attack in Maçka Park across the stadium. Explosions were followed by gunshots. 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 the Islamic State. A number of ambulances were dispatched to the scene. Armed police sealed off streets around the Vodafone Arena. President Recep Tayyip Erdoğan has been briefed by the officials. Six prosecutors were assigned to investigate the attack. Turkey has seen a recent spate of militant attacks in major cities that have left dozens of people dead. Transport Minister Ahmet Arslan wrote on Twitter that it was a terror attack.