Daniel Radcliffe is being protected by four ex-SAS soldiers after receiving a death threat.
The Harry Potter star has been assigned the security team - all of who used to work for the elite British army force, the Special Air Service - after worried movie bosses feared for his safety.
A source told The Sun: "There is a real concern for Daniel's welfare. No one has said what has been going on. It's all hush-hush - but security has been massively ramped up. Daniel has the four guards with him at all times."
The 18-year-old star is currently filming Harry Potter and the Deathly Hallows and although the nature of the threat - which was received via Warner Bros. who are producing the movie - is unclear, bosses aren't prepared to take any chances.
The actor switched cars three times on Saturday night (01.03.08) as we went to and from the film set. His regular driver - used by the star for seven years and considered "part of the family" - has been temporarily replaced.
Daniel has now been given a 'chase car' which follows the vehicle in which he is travelling in case of emergency.
The source said of the SAS guards: "They are all experts in evasive driving, threat assessment and close protection. This isn't about keeping an eye out for the paparazzi - these guys are looking for something far more sinister."
The protection is similar to that given to Princes William and Harry when they are not on military duty.