Britain's Prime Minister David Cameron speaks after Britain voted to leave the European Union, outside Number 10 Downing Street in London, Britain June 24, 2016.  [Photo/Agencies]

UK Prime Minister David Cameron said he would step down in three months' time to allow a new leader to negotiate the UK's exit from the European Union after Britons voted 51.9 percent to 48.1 percent to leave the EU in yesterday's referendum.

Cameron, who has been prime minister for six years, said his successor will trigger the so-called Article 50 which starts the departure process from the EU.

His successor would be elected by the members of party ahead of its annual conference in October.

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