A 12-year-old boy carried his six-year-old brother out of their home early yesterday after hearing their mother say in an emergency call to police that she would throw them out of the window then commit suicide. The mother was arrested on suspicion of child abuse when officers arrived to find her looking for the boys, who had taken refuge in another flat. Although uninjured, the children were taken to Princess Margaret Hospital for a check-up. The mother had made the emergency call from their 13th-floor unit of Wang Ching House, Cheung Wang Estate, Tsing Yi, after a heated telephone argument with her husband over their relationship, police said. Her husband was on the mainland at the time. 'After the dispute, the woman became emotional and made a 999 emergency call claiming she would throw her two sons out of the window and then commit suicide,' a police spokeswoman said. 'Her elder son heard this and carried his younger brother out of the unit.' The brothers ran to a 19th-floor flat and sought help from a 37-year-old male occupant.' The mother met police in the ground-floor lobby of the building, where she was arrested. The woman has been released on bail of $200 pending further investigation. She has to report back to Tsing Yi police in two weeks. Detectives from the Kwai Tsing district crime unit are investigating the case. The Social Welfare Department said social workers would follow the case and offer the necessary assistance to the family.