Video shows Turkish coastguard collision with migrant boat
Open source investigators Conflict News Network published a video on Sunday it said showed a Turkish coastguard vessel deliberately ramming a boat carrying Syrian migrants.
The migrants are seen shouting in panic as the coastguard vessel hits their inflatable and then circles around after them.
Turkey is home to more than 3.6 million asylum seekers from neighbouring Syria and is an important part of the migrant route to Europe.
The European Union signed an agreement with Turkey to limit the flow of migrants reaching Greek islands, but the European bloc reported a surge in migrant numbers last year.