Summary
A powerful earthquake has hit Gaziantep in south-eastern Turkey, near the border with Syria
The quake measured 7.8 magnitude on the US Geological Survey and hit at a depth of 17.9km
Turkish authorities have not yet reported any deaths or injuries but vision shows widespread damage in cities
Reports are coming in that several buildings have collapsed, and a number of people may be trapped
Picture show collapsed multi-storey buildings and people searching for others in the rubble
The quake was also felt in the capital Ankara and other regions across the country