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STORY: Harry launched a fierce attack on the "vile" press on Tuesday, blaming tabloids for destroying his adolescence and later relationships, as he gave evidence against a tabloid publisher whose titles he accuses of unlawful activities.

As he became the first senior British royal to appear in a witness box in more than a century, Harry also said the thought of people unlawfully intruding into the life of his late mother Princess Diana made him "feel physically sick."

The prince, the fifth-in-line to the throne, and 100 others are suing Mirror Group Newspapers (MGN), the publisher of the Daily Mirror, Sunday Mirror and Sunday People, at the High Court in London over allegations of widespread unlawful information gathering between 1991 and 2011.

In his 50-page written witness statement and during hours of cross-examination from MGN's lawyer Andrew Green, the younger son of King Charles said he had been targeted since 1996 when he was a schoolboy.

Harry said the press would try to destroy his relationships with girlfriends, blaming them for his break-up with Chelsy Davy, for causing his circle of friends to shrink, and for bouts of depression and paranoia.