HONG KONG - Hong Kong Chief Executive Leung Chun Ying's daughter posted a photograph on Facebook at 3am that appeared to show her lying in a bathtub with red-tinted water and a slashed wrist, the South China Morning Post reported on Thursday.
Next to it, the 22-year-old who is based in Britain, had written: "Will I bleed to death?"
The newspaper said a second picture was posted an hour later, about 11am Singapore time, showing an apparently bloodied hand and a message: "I love blood."
Ms Leung Chai Yan's messages were accessible to the public.
At the time, Mr Leung was on his way to Britain for the graduation ceremony of his younger daughter Leung Chung Yan who is studying Economics at Cambridge University, the Post said.
The Chief Executive's Office would not comment on the incident, the newspaper said.
It said that a website, Bastille Post, later uploaded a picture showing Mr Leung and Ms Chai Yan sitting on a park bench, smiling in the London sunshine. Her wrists cannot be seen in the picture.
Another picture, on the Speak Out Hong Kong website, showed Mr Leung, his wife, Regina Leung Tong Ching Yee, and Ms Chai Yan in Hyde Park.
The caption read: "They had big smiles on their face and the atmosphere was harmonious. Obviously, they weren't affected by various unfavourable rumours on the internet."
The Post quoted government sources as saying that Mr Leung had responded calmly when he heard of his daughter's posts after landing in Britain.
"He said only that he would follow up," said one of the sources.
"Leung seldom talks about his daughters and son as it is personal."
The posts were deleted within a few hours of their appearance.
By then, some comments had been posted under the picture. Some encouraged Ms Chai-yan to "stay strong". But other posts said she was seeking attention and the cuts were "not deep enough".