HARARE (AFP) - Zimbabwe has accused Britain of using a cholera outbreak, which killed nearly 600 people to seek foreign support for an invasion of the African nation, state-run Sunday Mail reported. British Prime Minister Gordon Brown said Saturday that world powers must join together to tell Zimbabwe President Robert Mugabe that "enough is enough". Reacting angrily to Brown's call, Zimbabwe government spokesman George Charamba said: "I don't know what this mad Prime Minister (Brown) is talking about... It has to do with regime change politics. He is asking for an invasion of Zimbabwe." "Zimbabwe has made an appeal to the international community. The international community has since responded through the World Health Organisation," he said. The newspaper quoted him as saying that he noted how the British Foreign Secretary David Miliband had been speaking about an invasion of Zimbabwe.US Secretary of State Condoleezza Rice also spoke about a regime change in the southern African country, the Mail said. Kenyan Prime Minister Raila Odinga "was made to talk about it (invasion). Archbishop Desmond Tutu was busy pleasing the erstwhile Dutch colonisers of South Africa by calling for an invasion of Zimbabwe," Charamba said, according to the newspaper. "Brown's call is supposed to cap it all. We think this owes to serious challenges Brown is facing at home. He has the temerity to call the Zimbabwe government 'a blood-thirsty regime'. This is from a prime minister who is killing daily in Iraq (...) Afghanistan." Britain on Thursday pledged extra aid to fight the cholera outbreak in its former colony where the death toll has hit 575, according to the UN.