A 12-year-old teenager has been arrested on suspicion of wounding his 15-year-old sister with a knife at their home in Lai King Estate, Kwai Chung.

Police were called to the flat in Yat King House just before 11pm on Monday.

The sister suffered injuries in the hand and was taken to Princess Margaret Hospital.

Investigators were unsure as to whether parents or guardians were present during the incident.