A 12-year-old Lethbridge boy is facing charges after police say he sexually assaulted his two younger sisters multiple times.

Police say they received information in July that the boy was engaging in sexual activity with his 10-year-old and eight-year-old sisters.

An investigation began and police determined the boy had sexually assaulted the two girls multiple times between May and July 2014.

The boy, who can't be identified, is charged with two counts each of incest, sexual assault, sexual interference and invitation to sexual touching.

He was released from custody but can not be around anyone under the age of 12 without adult supervision.

The boy appeared in youth court last week and will be back in court on Aug. 27.