KARACHI Three persons were killed in a sectarian clash on Monday which also injured three persons as tension gripped various areas. Violence started after the double murder of the activists of defunct sectarian Organisation Sipah-e-Sahaba (SSP). Abdul Hafeez and Sajid alias Mullah were gunned down late Monday night. The funeral prayers of both the victims were offered at Pital Wali Gali, Old Golimar area. Police said that the target killing started violence when participants in the funeral procession resorted to firing at Kazimia Imambargah. In retaliation of firing at Imambargah, armed men of rival sectarian group also resorted to firing over the participants of funeral procession which resulted in killing of another SSP activist Aqeel Ahmed while two others sustained injuries. The body was shifted to Abbasi Shaheed Hospital while the injured including Rehan, Abbas and Jaffar were shifted to hospital for medico-legal formalities.