Thousands of people across Hong Kong sang protest songs and marched on Friday to mark the one-year anniversary of a clash with police outside the semi-autonomous Chinese city's legislature.

Hundreds of protesters gathered in the popular Causeway Bay and Mongkok shopping districts, and in the Sha Tin shopping mall in the New Territories in the evening.

In Mongkok and Causeway Bay, police raised a blue flag, warning that the gatherings were unlawful and force might be used to disperse the participants.

Groups of protesters were detained and searched in Mongkok outside the metro station. Associated Press cameras captured the moment police moved to disperse protesters.

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