EU diplomats agreed Wednesday to add 28 individuals and bodies to its Belarus sanctions list in response to the alleged channelling of migrants to the bloc's borders.

Brussels accuses strongman Alexander Lukashenko's regime of mounting a "hybrid attack" against EU soil by luring thousands of Middle Eastern migrants to the Polish and Lithuanian borders.

Member states had already decided to slap sanctions on several Belarus targets, and on Wednesday senior envoys approved a list drawn up by the European Commission, diplomats said.

According to one of the officials, the new targets include 17 officials and 11 companies or official bodies. EU ministers are expected to formally ratify the decision on Thursday.

Also on Wednesday, the United States said it too would announce new sanctions against Belarus.

"I think you will very soon see a sanctions package that's been coordinated" between the US and the EU, a senior US state department official said.

A police officer holds up a light to check vehicles at a checkpoint near the village of Bialowieza, eastern Poland, close to the Polish-Belarusian border, on November 21, 2021 A police officer holds up a light to check vehicles at a checkpoint near the village of Bialowieza, eastern Poland, close to the Polish-Belarusian border, on November 21, 2021 Photo: AFP / Mateusz Slodkowski

Speaking on the sidelines of a visit by US Secretary of State Antony Blinken to Sweden, the official said the sanctions could be imposed as early as this week.

The EU has already imposed sanctions on 166 people and bodies, including Lukashenko and two of his sons, over a crackdown on protests over his disputed 2020 re-election.

Western capitals have refused to recognise the vote, arguing it was rigged, but Lukashenko has retained the support of Russia's President Vladimir Putin.

In June, Brussels imposed economic sanctions on key sectors of the Belarus economy -- potash, oil and tobacco -- and it has banned Belarus airlines from its air space.

The regime has allegedly responded by encouraging thousands of migrants -- mainly Syrians, Iraqis and Yemenis -- to fly to Minsk and head to the EU borders. Lukashenko denies he is responsible for the influx.

Polish police have set up razor wire barriers and turned back hundreds of travellers camped out in freezing, damp forests.

Polish authorities will not allow journalists into the border area, but reports suggest a dozen migrants have died in the chaos and squalid conditions.