Visitors to Turkey have been warned that demonstrations are planned to mark the anniversary of the Gezi Park protests.
The Foreign Office claims there have been calls on social media for protests to take place in Istanbul, Ankara and Izmir.
It says there may be demonstrations from May 31 to June 1, particularly around Taksim Square in Istanbul.
In June 2013, anti-government protesters were evicted from Gezi Park, during clashes between police and protesters.
