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Nasser Nasser, Associated Press
A video presentation on families of those killed in clashes with Egyptian security forces is broadcast in Tahrir Square after sundown in Cairo, Egypt, Wednesday, Jan. 25, 2012. Tens of thousands of Egyptians rallied Wednesday to mark the first anniversary of the country's 2011 uprising, with liberals and Islamists gathering on different sides of Cairo's Tahrir Square in a reflection of the deep political divides that emerged in the year since the downfall of longtime leader Hosni Mubarak.

CAIRO — The State Department's top human rights official says Egyptian authorities have banned a number of Americans from leaving the country. Those banned include the son of U.S. Transportation Secretary Ray LaHood.

Michael Posner said on Thursday that the move by Egyptian authorities has raised concerns about the country's transition to democracy and could impact U.S. aid.

A person familiar with the case says Sam LaHood, who heads the International Republican Institute in Egypt, was recently kept from boarding a flight out of Egypt. The person spoke on condition of anonymity because of the sensitivity of the issue.

LaHood's organizations was one of 10 raided last month by Egyptian authorities, who said they sought to determine if the groups were operating legally.