TOKYO (REUTERS) - Japan's Crown Prince criticised the media on Tuesday (Nov 30) for falsities and "terrible things" in its coverage of the engagement of his daughter, former princess Mako, who relinquished her royal status to marry a non-royal last month.

Ms Mako, 30, postponed her marriage to Mr Kei Komuro, 30, for roughly three years over opposition stemming from a scandal involving his mother. Ms Mako was diagnosed with post-traumatic stress disorder during that period.

In accordance with Japanese law, Ms Mako relinquished her royal status when the two married by submitting paperwork at a local office and left to live in New York this month.

Crown Prince Akishino, the emperor's brother, made the remarks, unusually candid for a Japanese royal, at a news conference to mark his 56th birthday.

"If you read the tabloids, well - I'm not sure how to say this exactly - but there are a lot of things in there that are fabricated, although there are also some opinions we should listen to," Crown Prince Akishino said when asked about the connection between media coverage and his daughter's diagnosis.

Though Japan was captivated when Ms Mako and Mr Komuro, a lawyer in the United States, announced their engagement in 2017, revelations of the scandal touched off intense media scrutiny and criticism.

"As for articles on the Internet, there are also lots of comments... and some of them say really terrible things," Crown Prince Akishino added. "There are people who are deeply hurt by this slander."

Some royal watchers said the furore over Ms Mako's marriage, which even sparked protests against the wedding, might have been toned down with more adept handling by the Imperial Household Agency (IHA), which runs the family's lives, pointing to how similar incidents are handled by royals overseas.

Crown Prince Akishino said the IHA does sometimes correct "mistaken" information on its website but implied that more might be needed.

"If you are going to argue against an article, you have to set proper standards and then protest when those are exceeded," he said. "Negative coverage may continue, so I think it is necessary to consider setting such standards in consultation with the IHA."

He also said that the decision to forego all ceremonies for the marriage had been his, as he felt the scandal - about money loaned to the Komuro family by Mr Komuro's mother's former fiance - had not been adequately explained.

But, he added, "I think it would have been appropriate if they could have been carried out as usual."