A six-storey building levelled in Istanbul, killing at least two people. Rescuers search for survivors in Istanbul's Sefakoy district. Hospitals in the city of Gebze ran out of beds for the injured. Buildings were reduced to rubble in Izmit, the city nearest the epicentre. The extent of the quake's force is revealed in Izmit, a densely populated industrial area.
Survivors say they are too scared to go back inside, fearing the impact of aftershocks.
Many people were injured jumping from balconies and out of windows in panic when the quake hit. The minaret of a mosque lies shattered after the quake in Izmit.