Police have charged three men and a woman, aged 16 to 47, with conspiracy to wounding with intent, over the knife- attack on a young boy in Lei Muk Shue Estate.

They will appear in Tsuen Wan Magistracy today.

Meanwhile, three men and a woman, aged 18 to 39, have been released on bail, and another three men, aged 16 to 41, are still being detained.