By politics.co.uk staff
The Stop the War campaign marched through central London today as part of a mass of coordinated protests around the capital.
Activists called on state leaders to "give peace a chance" as they headed from the American embassy in Grosvenor Square to Trafalgar Square in central London.
The demonstration brought together protestors from the Stop the War Coalition, Palestine Solidarity Campaign, The British Muslim Initiative, and the Campaign for Nuclear Disarmament.
"The G20 will meet at a time of world slump but they are spending more and more on war," said a statement on Stop the War's website.
Echoing the 'Yes We Can' rhetoric of US president Barack Obama - who is making his first visit to Britain as president to attend the G20 summit - the organisation said its message would be: 'Yes We Can'.
"Yes we can end the siege of Gaza and free Palestine, yes we can get the troops out of Iraq and Afghanistan, yes we can make jobs not bombs, yes we can abolish nukes, yes we can stop arming Israel," the website read.