A retired American army officer has been found hanged in an Egyptian prison cell six weeks after being arrested for breaking the national curfew.
The death is the latest in a series of incidents that have raised concerns about worsening attitudes to foreigners.
Officials said the man, named as James Lunn, 55, was found when prison officers in Ismailia on the Suez Canal went in to deliver his breakfast.
Mr Lunn was arrested in Sinai in late August, amid a crackdown on movement of residents in Egypt and particularly in Sinai following unrest after the removal of President Mohammed Morsi.
Last month Eric Lang, a Frenchman living in Cairo also arrested for breaching the curfew, was beaten to death by fellow inmates.
It is still not clear what Mr Lunn was doing in Sinai, though it is thought he might have been a history enthusiast since police found historical documents and maps when they arrested him.
He was said to have flown to Egypt from Bahrain two days previously.
The prosecutor's report referred to an explosion at a police station the previous day, and though there was no further statement on his involvement, this may have led to further investigation.
US embassy officials, who confirmed Mr Lunn's death from an "apparent suicide", visited him last week. On Saturday, his detention was extended by a court.
Meanwhile, the military's broader attempt to exert control is being stepped up. The cabinet approved measures to stop protests at the weekend, including a demand that 24 hours notice be given.