The Queen has passed human rights protesters on her way to a Diamond Jubilee lunch today with Commonwealth heads of state.
They were demonstrating against the President of Sri Lanka, who was one of the guests at the meal.
Glen Goodman has the details.
Over 500 Tamil protesters joined a demonstration in the City of London this morning, protesting against a visit by Sri Lankan President Mahinda Rajapaksa.
Tamil protesters staging a demonstration in the City of London are now reported to be on the move.
It is understood that they are heading from Bank to the Commonwealth Secretariat offices at Marlborough House on Pall Mall.
Tamil protesters are staging a demonstration outside the Mansion House in the City of London.
The Sri Lankan President Mahinda Rajapaksa had been due to address a Diamond Jubilee Commonwealth Economic Forum, but the morning session of the event has now been cancelled.
The protesters accuse Rajapaksa of running a dictatorial regime which represses the Tamil people.
A spokesman for Tamil Solidarity said: