Philippine police deployed Katy Perry pop songs to disperse protesters at an Asia-Pacific leaders' summit on Thursday, enraging some demonstrators but amusing others.
Hundreds of left-wing protesters rallied outside a venue where US President Barack Obama and other leaders of the 21-member Asia-Pacific Economic Cooperation (APEC) group were meeting.
The rally edged towards violence when protesters tried to break through lines of police, who were carrying riot shields and wooden batons, to reach the summit venue.