One of the cases resulted in the death of a man who was tortured with electric shocks and hit on the head and face with a shoe, Xinhua News Agency said yesterday.
Mustard oil was poured into suspects' mouths in other forms of torture, it said.
The seven cases happened in March 2013 at the Daowai district police sub-bureau in the northeastern city of Harbin. Three police officers and four people hired by police to help with the investigations were convicted and given prison sentences of up to 2 and a half years, it said.
In April, Zhao Chunguang, a national official overseeing police detention facilities, said there had not been a single case of torture to coerce a confession at any detention center in the past five years.
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But Xinhua's report said Harbin Intermediate People's Court heard appeals Aug. 29 by four of the seven people who had been convicted by a trial court on torture charges. Xinhua said the deceased man, identified by his surname, Liang, was detained by police on March 24 last year along with another man on suspicion of selling drugs.
In the only other case for which Xinhua provided details, a man surnamed Zhai w
Zhai testified that Cheng Xiaowei, Pan and Li Chunlong, another civilian, handcuffed him to an iron chair and tied wires from an old-fashioned telephone to his toes and started cranking the phone, giving him several rounds of electric shocks, Xinhua said.
Xinhua said that according to Chinese law, when suspects are being interrogated, torture is prohibited, at least two interrogators must be present and no non-police personnel are allowed. It said the Harbin cases "reflect the chaos in the process of law enforcement and severely hurts the public's trust in the judicial authority.