Polls are due to open in Ghana's presidential election

Polls are due to open in Ghana's presidential election, after all seven candidates aligned behind a pledge to keep the process peaceful.

The leading candidates are incumbent President John Mahama and former foreign minister Nana Akufo-Addo.
After polls close later this evening, official results are expected within three days.

The candidates signed a pact last week vowing to follow electoral rules and keep the peace.