British police say they have arrested nine terrorism suspects in the central city of Birmingham.
British media say the case centers on a suspected plot to kidnap and behead a Muslim member of the British military -- and to broadcast the killing on the Internet. Authorities have refused to comment on details of the plot.
A Birmingham police spokesman said eight of the suspects were arrested in pre-dawn raids. A ninth suspect was later detained nearby. The spokesman said the arrests followed many months of police activity, and that it could take days or weeks to complete the investigation.
Britain's Sky television described the intended victim as a male in his 20s who served with British forces in Afghanistan.
Home Secretary John Reid said a few details will be released as the probe continues.
He urged the media and the public to exercise constraint and to minimize speculation.
Last year, the head of Britain's domestic intelligence service, MI5, said it was probing about 30 domestic terror plots, and that agents were monitoring about 16-hundred suspects nationwide.