At least 20 people have died Friday as the Muslim Brotherhood is calling on their supporters to launch a “march of anger” against the military backed government.

The BBC is reporting the flashpoint is Muslim Brotherhood supporters opening fire on a police station. Police responded with tear gas and then opened fire. The government approved police using live ammunition to defend themselves if attacked by Brotherhood supporters.

“Egypt is in a deepening, really serious crisis,” the BBC’s Jeremy Bowen reported. “I can’t see how they can get out of it without a lot more violence and death.”

The government announced the army is being sent out to protect locations they consider vital to government operation. They have also taken to state TV and private broadcast stations to urge people to stay out of the downtown area because of “armed men” causing problems.

Counter protests have been formed by groups opposed to the Brotherhood and ousted president Mohammed Morsi.

The Muslim Brotherhood has also increased their attacks on Christians using the clashes between themselves and government forces as a distraction. So far the Brotherhood has burned 25 churches in the country along with multiple homes and businesses of Christians.

The United States issued a travel warning telling citizens to not go to Egypt and for any American in the country to immediately leave.