US Secretary of State John Kerry has arrived on an unannounced visit to Egypt as he begins a tour of countries in the region.
Kerry, the most senior American official to visit Egypt since the ousting of President Mohammed Morsi in July, will stay only a few hours.
The visit comes at a time of tension between Washington and Cairo.
Morsi is due to go on trial tomorrow.
Kerry will go on to tour countries in the Middle East and North Africa.