Greek riot police have fired tear gas to stop a fight involving up to 300 refugees and other migrants at a sprawling tent city on the country's northern border with the Former Yugoslav Republic of Macedonia.
Police say it was unclear why fighting broke out Tuesday between Afghans and Pakistanis armed with stones, sticks and metal bars at Idomeni. At least one man was injured, and no arrests were reported.
The camp is home to about 10,000 people thwarted from reaching Europe's prosperous heartland by a series of Balkan border closures this year.
Greek authorities have been trying for months, with little success, to persuade migrants at Idomeni to move to other organized camps.
About 54,000 refugees and other migrants are stuck in Greece, through which more than a million people passed since early 2015.