Anti-Israel activists have blocked a government building in central London.

Protestors held up a placard outside the UK Trade and Investment building that read: “Stop Arming Israel”.

Anti-boycott group Jewish Human Rights Watch condemned Thursday morning’s protest.

The demonstration came as police warned that violence could break out in the capital during annual anti-capitalist activity to mark November 5.

The Million Mask March recognises Guy Fawkes’ attempt to blow up Parliament in 1605.