British Prime Minister David Cameron faces tough new talks with European partners after through-the-night meetings failed to make much progress on his demands for a less intrusive European Union.

Britain's future in the union — along with heightened tensions around Europe's migrant crisis — are dominating an EU summit in Brussels scheduled to finish Friday with what Cameron hopes is a deal for EU reform.

He wrapped up talks in Brussels around 5:30 a.m. and is expected to resume meetings late morning.

A British official speaking on customary condition of anonymity said Friday morning there are "some signs of progress but nothing yet agreed and still a lot to do."

Cameron wants a deal that will let him urge Britons to vote "yes" to continued membership in an upcoming referendum.