Three students from Scots College, one of Sydney's most expensive private schools, have been charged in connection with the alleged sexual assault of a 14-year-old girl. The alleged incident occurred in an alleyway in Sydney's eastern suburbs on July 22.

Authorities arrested the three teenage boys on Thursday. Two of the charged students, aged 13 and 14, face charges of aggravated sexual assault in the company of others, as well as two counts of aggravated sexual touching of another person. A third 14-year-old boy is charged with one count of each offense.

Scots College has annual Year 12 fees exceeding $50,000.