Negotiators from the UK and EU are having what has been described as "intense technical discussions" in an attempt to agree a new Brexit deal.
Axar.az reports citing BBC.
About a dozen British officials, including the UK's EU adviser David Frost, are taking part in the talks at the EU Commission in Brussels.
The meetings are expected to continue through the weekend.
But European Council President Donald Tusk has suggested there is only the slightest chance of an agreement.
The UK is due to leave the EU at 23:00 GMT on 31 October and a European leaders' summit next Thursday and Friday is seen as the last chance to agree a deal before that deadline.
Prime Minister Boris Johnson's revised proposals - designed to avoid concerns about hard border on the island of Ireland after Brexit - were criticised by EU leaders at the start of last week.
However, on Thursday, Mr Johnson and the Irish prime minister Leo Varadkar held talks and said they could "see a pathway to a possible deal".