A work by renowned street artist Bansky has appeared in the centre of London, on the side of the Royal Courts of Justice building. The graffiti depicts a judge in a black robe hitting a protester lying on the ground, with blood splattered on his placard.

Banksy confirmed the work was his, posting a photo of it on Instagram on Monday morning.

According to the BBC, although the artwork does not reference a specific incident, its appearance came just two days after the mass arrests of nearly 900 people at a London demonstration against the ban on the Palestine Action group.

Banksy’s chosen location is on Carey Street, a usually quiet side behind the Courts of Justice, which on Monday was packed with people rushing to photograph the wall. Authorities placed large plastic sheets and metal railings to conceal the graffiti, and two security guards were stationed at the site. “I think it’s disgusting that they’re just covering it up,” said a citizen who passed by the spot.

Responding to Banksy’s work, a spokesman for Defend Our Juries, the group that organised Saturday’s demonstration, said it “starkly depicts the violence Yvette Cooper inflicted on protesters by banning Palestine Action.”