WASHINGTON, June 1 (Reuters) - President George W. Bush said on Friday he strongly condemned Iran's detention of U.S. citizens and called for them to be freed "immediately and unconditionally."

"Their presence in Iran -- to visit their parents or to conduct humanitarian work -- poses no threat," Bush said in a statement that referred to Haleh Esfandiari, Parnaz Azima, Kian Tajbakhsh and Ali Shakeri.

Bush also demanded to know the whereabouts of Robert Levinson, who has been missing since early March.

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