Vietnamese police detained scores of people taking part in an anti-China rally in Hanoi on Sunday in defiance of a government order to end a string of demonstrations that has stretched three months. It was the 11th anti-China rally in an unprecedented series of public protests that have taken place nearly every Sunday since early June according to a report of Reuters. The Hanoi city government on Thursday had issued an order to end "gatherings, demonstrations and spontaneous marches" and threatened to take "necessary measures" against those who defy the order. The anti-China demonstrations started after the Vietnamese government made public a case in late May in which it said Chinese patrol ships harassed a Vietnamese seismic survey ship operating in Vietnamese waters.