Turkey has warned its citizens against travel to the United States, saying Turks face the risk of arbitrary arrest and should take precautions if they do decide to travel.
The travel warning came a day after the United States urged its citizens to reconsider travel to Turkey, saying "terror groups continue plotting possible attacks in Turkey".
The warning published on the official website said: "It has been observed that there is a recent increase in terrorist and violent attacks in the United States", referring to several deadly incidents over the past few months.
The tit-for-tat diplomacy fits the recent deterioration in relations between the North Atlantic Treaty Organisation allies.
Turkey has issued travel warnings to its citizens who are planning to go to the US.
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It singled out areas along the Turkish-Syrian border and area where the Turkish army is fighting Kurdish militants, warning that U.S. citizens could be accused of being linked to terror groups with "scant or secret evidence and grounds that appear to be politically motivated".
It also warned about "arbitrary arrests" in the USA - an apparent reference to a Turkish banker who was arrested in the US and convicted of helping Iran avoid US sanctions.
In return, the Turkish foreign ministry said Turkish public sector employees in the USA had been detained on "baseless allegations".