The sticking points include demands for an Irish Language Act and marriage equality
The Stormont talks on power-sharing in the North are back on a knife-edge.
A series of deadlines to find a way to restore devolution have been missed and the latest, for Monday, appears to be in jeopardy too.
The much halted, delayed and postponed deadline for agreement failed again on Thursday and London pushed it back again to tomorrow.
The sticking points between Sinn Féin and the Democratic Unionist Party (DUP) include demands for an Irish Language Act, marriage equality and a way to deal with the legacy of the North's violent past.
British Prime Minister Theresa May had phone conversations with both parties on Friday night, urging them to reach agreement.
But speaking at a marriage equality rally in Belfast on Saturday, Sinn Féin President Gerry Adams said he did not believe a deal could be pieced together by Monday.
Northern Ireland Secretary James Brokenshire is due to address the UK House of Commons tomorrow on how to proceed.
If no agreement is reached by then, that could involve calling a snap assembly election, setting another deadline for talks or re-imposing direct rule from London.