Zimbabwe's government has banned at least one international aid group from operating in the country for allegedly campaigning for the opposition.All operations of Care International are now suspended, pending an inquiry into the claims.
Care denies that it "has encouraged or tolerated any political activity".
The ban comes as Zimbabwe prepares for a run-off election between President Robert Mugabe and opposition leader Morgan Tsvangirai on 27 June.
Some four million Zimbabweans - a third of the population - are believed to need food aid.
Mr Mugabe is currently attending the UN's food summit in Rome, where the UK and Australia have called his presence "obscene".
They blame him for destroying Zimbabwe's once thriving economy.
Mr Mugabe in turns says a Western plot and poor rains are behind the hunger in his country.
Humanitarian operations
Social Welfare Minister Nicholas Goche has been quoted as saying that other aid agencies could also have their activities halted.
"Several other non-governmental organizations involved in food distribution in Manicaland province will also be asked to cease operations while we investigate them," he told the ZimOnline website.
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