Hungarian police fired tear gas and water cannon at protesting migrants demanding they be allowed to enter from Serbia on Wednesday as a border crackdown by Budapest turned violent.

Thick black smoke billowed over the area as mainly young male migrants broke up stones and concrete on the road and lobbed them at lines of riot police.

Police, backed by special anti-terrorist units, responded with water cannon and tear gas from the other side of a metal barrier rolled out across the road at the Roszke-Horgos border crossing.

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