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Macedonian troops fire stun grenades to disperse migrants stuck on border with Greece

  • Migrants rest near the border train station of Idomeni, northern Greece, as they wait to be allowed by the Macedonian police to cross the border from Greece to Macedonia, Thursday, Aug. 20, 2015. Thousands of migrants were stranded Thursday on no-man's land between Macedonia and Greece near the Macedonian town of Gevgelija, from where they planned to catch trains that would take them to the Serbian border on their way to EU-member Hungary. (AP Photo/Darko Vojinovic)

    Migrants rest near the border train station of Idomeni, northern Greece, as they wait to be allowed by the Macedonian police to cross the border from Greece to Macedonia, Thursday, Aug. 20, 2015. Thousands of migrants were stranded Thursday on no-man's land between Macedonia and Greece near the Macedonian town of Gevgelija, from where they planned to catch trains that would take them to the Serbian border on their way to EU-member Hungary. (AP Photo/Darko Vojinovic)  (The Associated Press)

  • Migrants rest near the border train station of Idomeni, northern Greece, as they wait to be allowed by the Macedonian police to cross the border from Greece to Macedonia, Thursday, Aug. 20, 2015. Thousands of migrants were stranded Thursday on no-man's land between Macedonia and Greece near the Macedonian town of Gevgelija, from where they planned to catch trains that would take them to the Serbian border on their way to EU-member Hungary. (AP Photo/Darko Vojinovic)

    Migrants rest near the border train station of Idomeni, northern Greece, as they wait to be allowed by the Macedonian police to cross the border from Greece to Macedonia, Thursday, Aug. 20, 2015. Thousands of migrants were stranded Thursday on no-man's land between Macedonia and Greece near the Macedonian town of Gevgelija, from where they planned to catch trains that would take them to the Serbian border on their way to EU-member Hungary. (AP Photo/Darko Vojinovic)  (The Associated Press)

  • A migrant boy collects firewood near the border train station of Idomeni, northern Greece, as they wait to be allowed by the Macedonian police to cross the border from Greece to Macedonia, Thursday, Aug. 20, 2015. Thousands of migrants were stranded Thursday on no-man's land between Macedonia and Greece near the Macedonian town of Gevgelija, from where they planned to catch trains that would take them to the Serbian border on their way to EU-member Hungary. (AP Photo/Darko Vojinovic)

    A migrant boy collects firewood near the border train station of Idomeni, northern Greece, as they wait to be allowed by the Macedonian police to cross the border from Greece to Macedonia, Thursday, Aug. 20, 2015. Thousands of migrants were stranded Thursday on no-man's land between Macedonia and Greece near the Macedonian town of Gevgelija, from where they planned to catch trains that would take them to the Serbian border on their way to EU-member Hungary. (AP Photo/Darko Vojinovic)  (The Associated Press)

Macedonian special police forces have fired stun grenades to disperse thousands of migrants stuck on a no-man?s land with Greece, a day after Macedonia declared a state of emergency on its borders to deal with a massive influx of migrants heading north to Europe.

The crowd of some 3,000 migrants who spent night out in the open made several attempts to charge Macedonian police early Friday after the border was shut to crossings the previous day. At least four people were injured in the melee.

Police backed by armored vehicles also spread coils of razor wire over rail tracks used by migrants to cross on foot from Greece to Macedonia.

Greece has seen an unprecedented wave of migrants crossing clandestinely to its islands from the nearby Turkish coast.