The video, posted by lawyer Sittra Biabungkerd on his Facebook page, showed what appeared to be a man being suffocated by a plastic bag placed over his head while he was pinned down by four men.
Five police officers from Nakhon Sawan province were arrested, deputy police spokesman Kissana Phathanacharoen said in a statement, while a “round the clock” hunt was on for two others who later handed themselves in.
An official police document showed that the suspect died of a drug overdose on August 5, before the video of the incident went viral on Tuesday.
Sittra, who runs a legal aid foundation, said he received the video clip from a lower-ranking officer who asked him to pass it to the national police chief, claiming it showed “Superintendent Joe” of Nakhon Sawan police station trying to extort money from a drug dealer.
Superintendent Joe, or Police Col. Thitisan Uttanapol, one of the two who gave himself up for questioning, said he had ordered his men to get information from the suspect…