A worker counts ballots after polling stations closed in the Referendum on the European Union in Islington, London, Britain, June 23, 2016.[Photo/Agencies]

LONDON -- With results from the first 13 of 382 voting districts, plus partial BBC Northern Irish figures, those in favor of ending Britain's 43-year membership were on 50.8 percent of the vote, while those wanting to stay were on 49.2 percent.

But it was too early to establish a firm trend in a contest that remained too close to call. Opinion surveys pointed to a vote to Remain, and two prominent anti-EU campaigners said they expected to lose.

Results are due to be announced throughout the night.