Celebrities including SIR ELTON JOHN, GEORGE CLOONEY and SIR MICK JAGGER have urged world leaders step up their efforts to remedy the situation in Sudan’s troubled Darfur region.The stars released the statement yesterday to coincide with the Global Day for Darfur Sunday, marking the fourth anniversary of the conflict and organised by Amnesty International and Human Rights Watch.Endorsed by Bob Geldof, Hugh Grant, and Mia Farrow too, the statement said, "The international community must end its stalling and take decisive action.The perpetrators who carry out these atrocities must be challenged and stopped." Protests will occur in London today including a demonstration at Downing Street and outside the Sudanese embassy. Fighting in Darfur has so far resulted in 200,000 deaths and two million.