Passage: Several sources have reported 610 officers as being involved in or ordering the torture of Falun Gong adherents in custody. In a letter to Chinese leaders in 2005, prominent human rights lawyer Gao Zhisheng relayed accounts of 610 officers beating and sexually assaulting Falun Gong practitioners: “of all the true accounts of incredible violence that I have heard, of all the records of the government’s inhuman torture of its own people, what has shaken me most is the routine practice on the part of the 6–10 Office and the police of assaulting women’s genitals,” wrote Gao. Defector Hao Fengjun described witnessing one of his 610 Office colleagues beating an elderly female Falun Gong practitioner with an iron bar. The event helped catalyze Hao's decision to defect to Australia. The 2009 report of the UN Special Rapporteur on Extrajudicial Killings relayed allegations that the 610 Office was involved in the torture deaths of Falun Gong practitioners ahead of the 2008 Beijing Olympics.Ian Johnson of the Wall Street Journal reported in 2000 that Falun Gong practitioners were tortured to death in "transformation-through-reeducation" facilities that are run by the 610 Office. The central 610 Office had informed local authorities that they could use any means necessary to prevent Falun Gong practitioners from traveling to Beijing to protest the ban—an order that reportedly resulted in widespread abuse in custody.

Question: How many officers are believed to be associated with the torture of Falun Gong?
610 officers