The source said the younger daughter was found to be safe in the family's flat on the 15th floor.
The father is divorced, and lives with his three daughters. The eldest daughter was not home at the time of the incident.
Officers located the father when he returned home.
The source said the man was likely to be arrested for ill-treatment or neglect of a child, an offence carrying a maximum penalty of 10 years in jail.
According to statistics from the Social Welfare Department, there were 789 newly reported child abuse cases in the first nine months of 2019.
Among the 789 reports, 62.8 per cent involved the victims' parents, while 23.4 per cent were related to neglect.
The number of child abuse cases hit a 14-year high in 2018 when the department recorded 1064 new incidents.
- South China Morning Post