Prince Harry sues for UK police protection
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Last summer, Harry's car was chased by paparazzi photographers as he left a charity event in London. The next day, he and elder brother William unveiled a statue of their late mother, Princess Diana.
She died in Paris in 1997 after a high-speed car chase also involving photographers, and Harry's relations with the UK media remain fraught.
The legal representative noted Harry had served two tours of combat duty in Afghanistan, and said "in recent years his family has been subjected to well-documented neo-Nazi and extremist threats".
A UK government spokesperson refused to comment on any legal proceedings but said its protective security for VIPs was "rigorous and proportionate".
"It is our long-standing policy not to provide detailed information on those arrangements. To do so could compromise their integrity and affect individuals' security," the spokesperson said.
Harry's uncle Prince Andrew is meanwhile facing calls to pay for his own security after he was stripped of his military titles, in the fallout of a US civil case alleging sexual assault.