By Jasmina Mironski with Vassilis Kyriakoulis in Edomeni, Greece
Macedonian riot police have fired stun grenades to drive back thousands of mostly Syrian refugees stuck in no-man's land between Greece and Macedonia, the latest flashpoint in Europe's escalating migrant crisis.
At least eight people were hurt on Friday (local time) near the Greek border village of Edomeni as the police in riot gear beat the migrants back with truncheons and threw the stun grenades, devices that produce a blinding flash of light and a huge noise to disorient their targets.
The grenades set off clouds of smoke, sending panicked refugees running for cover. Some were injured as they fell to the ground; one youth's face was covered in blood.
Rights group Amnesty International blasted the police response, saying it had received reports that officers fired into the air in "an unacceptable push-back in violation of international law".
Macedonia had on Thursday declared a state of emergency and sealed the border, stranding more than 3000 mostly Syrian refugees who are hoping to travel onwards to northern Europe and start a new life.
But after tensions boiled over on Friday, Macedonia said it would allow a limited number of "vulnerable" migrants to enter and some 500 refugees were able to cross the border, mostly families with children and pregnant women.
In Brussels, the European Commission defended itself against charges that the EU is responding too slowly to Europe's biggest migration crisis since World War II.
Dimitris Avramopoulos, the EU's Migration and Home Affairs Commissioner, insisted the commission had been working "day and night" to offer funding and other support to states struggling to cope with the influx of migrants from the Middle East, Africa and South Asia.
German Interior Minister Thomas de Maiziere had said on Thursday that it was "unacceptable that European institutions continue to work at their current slow pace" in finding a joint solution to the crisis.
The numbers on the Greek-Macedonian border have been building for a couple of days, and Friday's clashes broke out as the crowd surged towards the police cordon, shouting "Help us".
Macedonian officers fired the stun grenades after hundreds of migrants, including children, tried to cross newly-laid rolls of barbed wire along the frontier, an AFP photographer at the scene said.
Authorities played down the unrest, with interior ministry spokesman Ivo Kotevski stressing that tear gas was not used.
"Macedonian authorities are responding as if they were dealing with rioters rather than refugees who have fled conflict and persecution," said Amnesty International's deputy Europe director Gauri van Gulik.
"Every country has the power to patrol its own borders, but this kind of para-military response is an unacceptable push-back in violation of international law."
Jad, a 25-year-old Syrian who has been waiting at the border for three days, told AFP: "We are very angry because the police had told us they would let us through today. We are not animals."