Julian Assange, the founder of Wikileaks, has been pictured in an Anonymous mask at the Occupy London protest on Saturday. Assange joined 3,000 other anti-capitalist protesters near London’s Stock Exchange.

Photographer Mike Kemp captured these images of Julian Assange, who was later forced to remove the mask by a London police officer.

Assange then made an impromptu speech to a section of the protesters concerning anonymity. He stated,

“Under a new section used, people cannot wear masks in London, they cannot wear facial coverings in London, and that basic anonymity is denied to people. I say, that sometimes it may be legitimate to deny anonymity, but we should not accept it until Swiss bank account and offshore bank accounts are also denied of their anonymity.”

Assange’s appearance and subsequent address were met by general approval from the crowd, although a small section openly voiced their disapproval.