The Supreme Court Monday extended the house arrest of the five activists held in connection with the investigation into the Bhima-Koregaon violence till September 19, when the court will hear the matter next. Five activists — P Varavara Rao, Vernon Gonsalves, Arun Ferreira, Sudha Bharadwaj and Gautam Navlakha — were arrested last month for their alleged Maoist link.