An 11-year-old boy was in critical condition after falling from a window at his home in Tai Po in Hong Kong’s New Territories on Monday.

At 6am, the boy, who lives with his family in an apartment on the third floor of Parc Versailles, a residential cluster on Mui Shu Hang Road in Tai Po, was found lying on the podium of the first floor of the building, Sing Tao Daily reported.

He suffered severe injuries to his head and legs. Paramedics sent him in a conscious state to Prince of Wales Hospital in Sha Tin. He was reported to be in critical condition after surgery.

It was understood that the boy, suspected of suffering from a hyperactive disorder, had been under medical treatment.

The boy got upset when woken at 6am for school. He went into the washroom and stayed inside for a long time. He did not reply after his mother knocked on the door a few times.

The mother then heard a loud noise from outside and discovered that her son had fallen from the washroom window.

Police ruled out foul play and believed that the boy climbed over the window sill and fell from the building by accident.

Hyperactive disorder is a brain dysfunction marked by an ongoing pattern of inattention and/or hyperactivity-impulsivity that interferes with functioning or development. In Hong Kong, about 40,000 to 50,000 children and teenagers have been diagnosed with the disorder.