The annual protests take place on the anniversary of the city's return to China by colonial power Britain in 1997 but saw one of the lowest turnouts in history this year.
In an unprecedented show of unity, millions of people including opposition leaders in Istanbul attended a rally for democracy which is the largest political gathering in the history of the modern Turkish Republic.
The leaders of Turkey's main opposition parties are attending the Democracy and Martyrs' Rally led by President Erdogan, which is intended to show solidarity against last month's failed coup attempt.
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