in the first week of September. Independent reports said the number of dead was far higher, ranging from 6,000 to 10,000. Some newspapers reported the rumors as fact, including the allegation that Koreans were poisoning wells. The numerous fires and cloudy well water, a little-known effect of a large quake, all seemed to confirm the rumors of the panic-stricken survivors who were living amidst the rubble. Vigilante groups set up roadblocks in cities, and tested civilians with a shibboleth for supposedly Korean-accented Japanese: deporting, beating, or killing those who failed. Army and police personnel colluded in the vigilante killings in some areas. Of the 3,000 Koreans taken into custody at the Army Cavalry Regiment base in Narashino, Chiba Prefecture, 10% were killed at the base, or after being released into nearby villages. Moreover, anyone mistakenly identified as Korean, such as Chinese, Ryukyuans, and Japanese speakers of some regional dialects, suffered the same fate. About 700 Chinese, mostly from Wenzhou, were killed. A monument commemorating this was built in 1993 in Wenzhou. In response, the government called upon the Japanese Army and the police to protect Koreans; 23,715 Koreans were placed in protective custody across Japan, 12,000 in Tokyo alone. The chief of police of Tsurumi (or Kawasaki by some accounts) is reported to have publicly drunk the well water to disprove the rumor that Koreans had been poisoning wells. In some towns, even police stations into which Korean people had escaped were attacked by mobs, whereas in other neighborhoods, civilians took steps to protect them. The Army distributed flyers denying the rumor and warning residents against attacking Koreans, but in many cases, vigilante activity only ceased as a result of Army operations against it. In several documented cases, soldiers and policemen participated in the killings, and in other cases, authorities handed groups of Koreans over to local vigilantes, who proceeded to kill them. Amidst the mob violence against Koreans in the Kantō Region, regional police and the Imperial Army used the pretext of civil unrest to liquidate political dissidents. Socialists such as (平澤計七), anarchists such as Sakae Ōsugi and Noe Itō, and the Chinese communal leader, (王希天), were abducted and killed by local police and Imperial Army, who claimed the radicals intended to use the crisis as an opportunity to overthrow the Japanese government. Director Chongkong Oh made two documentary films about the pogrom: Hidden Scars: The Massacre of Koreans