A government source has told the BBC there will be "no deal tonight", as officials continue to work on the technical details in Brussels.

The UK and EU had been hoping to sign off a revised Brexit deal before Thursday's crunch EU council meeting.

The BBC's Laura Kuenssberg said it was not now clear whether there would be a deal at all this week.

Boris Johnson has been trying to get Tory Brexiteers and the DUP to back his revised plan for Northern Ireland.

Laura Kuenssberg said she understood the issues between the UK, EU and Ireland were "pretty much sorted", but it was still not clear whether the DUP were ready to sign up or not.

The Democratic Unionist Party has propped up the Conservative government since the 2017 general election and their support could be vital if Parliament is to approve any agreement Mr Johnson secures.

Earlier, the PM likened the Brexit talks to climbing Everest, saying the summit was "not far" but still surrounded by "cloud".