High Quality Content by WIKIPEDIA articles! The China anti-Japanese demonstrations of 2012 were a series of initially peaceful demonstrations held across major cities in China during August and September 2012. The main cause of the demonstrations was the escalation of Senkaku Islands dispute between China and Japan around the time of the anniversary of "September 18 Incident". The protesters in several cities later became violent and the local authorities began arresting demonstrators and banning the demonstrations.