The brother of a Hamas spokesman has died in an Egyptian prison after being tortured, the Islamic group said on Tuesday.
According to the group, Yousef Abu Zuhri died from internal bleeding. He was the brother of spokesman Sami Abu Zuhri.
On Tuesday, another spokesman, Fawzi Barhoum, urged Egypt to investigate.
However, an Egyptian prison official said that Abu Zuhri died of heart and kidney failure due to pre-existing conditions, and another security official in Cairo said the man was not tortured. Both spoke on the condition of anonymity because they were not authorized to speak to the press.
Abu Zuhri was arrested in April for entering Egypt illegally.