Egyptian president's National Security Advisor says that a military coup is now under way, according to Reuters.
The advisor said that he expects the army and police to remove pro-Morsi demonstrators and that no military coup can succeed against popular resistance without considerable bloodshed.
The Muslim Brotherhood tells ITV News they are against violence but will "pay the price of their blood" to restore their ousted president.
Egypt's army has named two further officials in the transitional government as its supporters and opponents vowed to stay on the streets.
There has been outrage in Egypt after 51 people were killed near an barracks where ousted President Mohamed Morsi is thought to be held.