Joe Biden has said it is "time to heal" the US in his first speech as president-elect, vowing "not to divide but to unify" the country.

"Let's give each other a chance," he said at an event in Delaware addressing those who did not vote for him.

Mr Biden defeated incumbent President Donald Trump following a cliff-hanger vote count after Tuesday's election.

Mr Trump has yet to concede and has not spoken publicly since his defeat was announced while he was playing golf.