Three men from central England accused of building an improvised explosive device and making other preparations for a terrorist attack were appearing in court on Tuesday, prosecutors said.
Jewel Uddin, 26, Omar Mohammed Khan, 27, and Mohammed Hasseen, 23, were scheduled to appear at London's Westminster Magistrates' Court after they were charged late Monday.
The three are among seven people detained after police stopped a car on a highway in central England on June 30, suspecting it had no insurance.
A search of the impounded vehicle turned up guns and weapons, prompting police to trace and arrest the driver, passenger and other suspects.
The nature of the arrests has prompted concern that British authorities may have been unaware that an alleged plot was developing, unlike many other cases when police move in to make arrests after observing suspected terrorists for weeks or months.
Authorities insisted neither case is directly linked to the Olympics. But David Anderson, Britain's ombudsman for anti-terrorism laws, said police and intelligence agencies were probably not prepared to take any risks in the buildup to the event.