"We expect more attacks". Migrants set up a camp along the border with Belarus

"Further attempts by migrants to force the border in the area of Kuźnica" - such comments were being attached to footage published in social media on Monday by Poland's defence and interior ministries, as well as by the Border Guard.

The latest video published on Twitter after 4 p.m. by the Defence Ministry shows numerous campsites spanning along the border line. The ministry informed that interior ministry services and soldiers have prevented the "first mass attempt to storm the border", and that the migrants have set up a camp near Kuźnica. "They are being constantly watched by Belarusian services," the ministry said.

Poland expects groups of several hundred migrants each to attempt to cross into the country from Belarus in the coming hours, as thousands gather at the frontier, Polish government officials said on Monday.

Warsaw has accused Belarus of trying to spark a major confrontation, while video clips showed hundreds of migrants walking towards the Polish border and some trying to breach the fence using spades and other implements.

"We expect that in the coming hours attacks on our border will be renewed by groups of several hundred people," Paweł Soloch, the head of Poland's National Security Bureau, told reporters.

Polish government spokesman Piotr Muller said that there were currently 3,000-4,000 migrants near the border, and more than 10,000 others across Belarus ready to try and cross into Poland.

Warsaw said it had deployed additional soldiers, border guards and police, while neighbouring Lithuania said it might introduce a state of emergency on its border with Belarus.