The Guwahati Police on Saturday detained seven people in connection with black flag protests against PM Narendra Modi, Police Commissioner Deepak Kumar said. Prohibitory orders have been imposed in Guwahati for three months, Kumar added. Members of All Assam Students' Union and Asom Jatiyatabadi Yuva Chhatra Parishad on Saturday waved black flags to protest against Citizenship (Amendment) Bill.