"This is the second incident in a short period of time. First we had the case of car park attendant B Prabakar and now this," he told Malaysiakini.
The Prabakar-case involved police personnel allegedly abusing and pouring hot water on the man while being questioned in police custody. He was picked up to assist in investigations into a robbery.
Subsequently, seven police personnel were charged with voluntarily causing hurt to Prabakar and 18-year-old C Solomon Raj to make them confess to a criminal intimidation case.
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"The police must reveal why Kugan had so many scars on his body. Why were there deep cuts in his wrists?
"And they must also explain how the interrogation was conducted and by whom," he said.