Egyptian officials say a dual U.S.-Egyptian citizen has been detained on arrival at Cairo airport because he faces trial in a case of pro-democracy groups receiving foreign funds.
The officials said Sherif Mansour was detained Sunday as one of 43 defendants, including 16 Americans, on trial in the case that has shaken Cairo's ties with Washington.
The officials spoke on condition of anonymity because they were not allowed to speak to reporters.
The trial began in February, with only 14 Egyptian defendants attending.
Mansour was returning to Egypt to attend the next session, set for Tuesday.
The defendants are facing charges over their groups' receiving foreign funds without permits. Six Americans charged in the case were allowed to leave the country in March.