A powerful earthquake has hit Gaziantep in south-eastern Turkey, near the border with Syria.
The US Geological Survey said the 7.8 magnitude tremor struck at 04:17 local time (01:17 GMT) at a depth of 17.9km (11 miles) near the city of Gaziantep. The quake was felt in the capital Ankara and other Turkish cities, and also across the region.
Reports are coming in that several buildings have collapsed, and a number of people may be trapped. A BBC Turkish correspondent in Diyarbakir reports that a shopping mall in the city collapsed.
Rushdi Abualouf, a BBC producer in the Gaza Strip, said there was about 45 seconds of shaking in the house he was staying in.
Turkish seismologists estimated the strength of the quake to be 7.4 magnitude. They said that a second tremor hit the region just minutes later.