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A 45-year-old man has been arrested by police investigating the deaths of three men in Plymouth.
The Devon and Cornwall force said the man was arrested on Thursday on suspicion of being concerned in the supply of drugs.
Police said two men aged in their 20s and 30s were pronounced dead at an address in Welbeck Avenue on Saturday and a third man, aged in his 30s, was found dead in a property on North Road East the following day.
The deaths continue to be treated as linked and unexplained, and Plymouth City Council believes they are linked to blue pills being sold illegally as Valium.