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A man illegally detained by Mexican marines on 3 August has not been seen since. Navy officials deny detaining him.
Venezuelan human rights defender Víctor Martínez is in danger, as the two men on trial for the murder of his son are free: one has escaped and the other was given parole.
Former government minister Geldimurat Nurmuhammedov was released after nine months of forced medical treatment. He was likely targeted because of his political criticism.
Three people, two of them children, were detained by Mexican marines in late July and have not been seen since. The military authorities have denied arresting them.