The airspace over Turkey's northwestern region of Marmara has reportedly been closed to civilian flights. According to the information provided by Anadolu Agency, citing information of Turkish aviation authorities, the airspace will remain closed until 18.05 o'clock (GMT) on Saturday. The closure of the airspace in the region, which is close to Turkey's borders with Bulgaria and Greece, comes after the unsuccessful attempt for coup carried out by a group within the Turkish military overnight. The measure means that all airports in the region, including those in Istanbul, will remain closed to passenger flights. Some of the busiest transit flight routes from Europe to the Middle East and Asia pass above the region. A total of nine flights between the airport in the Bulgarian capital and Turkey have been cancelled on Saturday. Three flights from Istanbul scheduled to land in Sofia at respectively 9.05, 14.10 and 20.45 o'clock (EET) as well as the flight from Antalya scheduled to arrive in the Bulgarian capital at 19.10 o'clock (EET) have all been cancelled. Three flights to Istanbul scheduled to depart from Sofia at respectively 10, 15.05 and 21.40 o'clock (EET) as well as two flights to Antalya scheduled to take off from the Bulgarian capital at respectively 9.15 and 14.50 o'clock (EET) have also been cancelled. At the same time, tens of Bulgarians have been stuck for hours at Ataturk airport in Istanbul as they still await information on their scheduled flights.