From the BBC:
Typing Error Causes Nuclear Scare
The Sudanese government had a nasty shock this week, when it read on a US Congress website that the Americans had conducted nuclear tests in the country.
A House of Representatives committee report mentioned tests conducted in Sudan between 1962 and 1970.
However, when alarmed Foreign Minister Mustafa Osman Ismail raised it with US officials in Khartoum, it turned out to be a typing error.
The report should have said Sedan, a test site in the US state of Nevada.