efe-epaShirley Lau Hong Kong

Chaos and violence descended on at least a dozen districts in Hong Kong on Sunday, as anti-government activists staged flash mob protests, vandalized selected shops and clashed with police, in familiar scenes that have played out in the territory over the past weeks.

Defying a newly introduced ban on face masks in protests, various groups of protesters put on a mask and gathered at shopping malls in different districts in the afternoon, responding to calls from anti-government netizens via a popular online forum.