Turkey has reportedly closed its main border crossings into northwest Syria after its troops were attacked by Syrians angry at violence against their compatriots in Turkey.
Turkish police had earlier announced the arrest of nearly 500 people following attacks on Syrian properties and vehicles in several Turkish cities.
The country is now home to more than three million Syrian refugees and tensions with local communities are growing.
At least four people were killed in the Syrian border town of Afrin in exchanges of fire between Turkish troops and armed protesters. Angry Syrian civilians also threw stones at Turkish convoys and tore down Turkish flags.
