At least one person is dead after Egyptian troops opened fire on mostly Islamist protesters marching on a Republican Guard headquarters today in Cairo.
White House officials say President Barack Obama's national security team is briefing the president on the upheaval in Egypt and their conversations by phone with leaders in the region.
The supreme justice of Egypt's Supreme Constitutional Court has been sworn in as the nation's interim president, replacing the Islamist Mohammed Morsi who was ousted by the military.
Fearing a political-military implosion that could throw an important Arab ally into chaos, the Obama administration is wading into Egypt's turmoil, delivering pointed warnings to the three main players in the crisis: President Mohammed Morsi, opposition protesters demanding his ouster and the Egyptian military.
There's an old saying that someone will be "spinning in their grave". But for a British museum, that's taken on a whole new, unexplained meaning.
Mohammed Morsi was declared Egypt's first Islamist president on Sunday after the freest elections in the country's history, narrowly defeating Hosni Mubarak's last Prime Minister Ahmed Shafiq in a race that raised political tensions in Egypt to a fever pitch.