The suspect, who was captured in a raid at a hotel in central Prague, did not resist arrest, but he had medical problems and was briefly hospitalized, the police said in a statement.
David Schön, a police spokesman, said on Wednesday that the man, whose name has not been released, was arrested on Oct. 5. “We postponed the announcement for tactical reasons,” he said.
The statement said that “the man was a Russian citizen suspected of hacking attacks on targets in the United States,” and that the raid was conducted in collaboration with the F.B.I. after Interpol issued an arrest warrant for him.