Long queues in central Nairobipublished at 06:36 British Summer Time 8 August 2017
People are sharing pictures on Twitter of queues of voters around the country.
A professional photographer took this picture at a polling station at a school in the centre of the capital, Nairobi:
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The BBC's Ferdinand Omondi sent us this picture of voters entering a polling station in Kwale in the east of the country just after polls opened at 03:00 GMT (6am local time):