More than 500 people have reportedly been killed in one day as violent chaos continues throughout Egypt. Both the army and Muslim Brotherhood say they're not backing down, letting the seeming "war zone" to remain a battlefield, with churches being torched in revenge by the Brotherhood as Coptic Christians support the army forces.

Watch the latest horrific scenes from the region in Leland Vittert's report above. Plus, more from, below:

A defiant Muslim Brotherhood declared Thursday it will not back down against a crackdown by Egypt's interim government, vowing to "bring down this military coup" as hundreds of protesters stormed and torched two government buildings in Giza, state television and witnesses say.

State television footage showed firefighters evacuating employees from the larger of the two offices in Giza, Cairo's twin city on the west bank of the Nile River. Police arrested several protesters.

Witnesses told Reuters that hundreds of Muslim Brotherhood supporters also were marching in Alexandria to protest Wednesday's clashes between Egyptian security forces and Brotherhood demonstrators, which left more than 500 dead across the country. Protesters were seen carrying pictures of former President Mohammed Morsi and those killed in the violence. A march in Cairo is slated for Thursday afternoon.

"We will push until we bring down this military coup," Muslim Brotherhood spokesman Gehad El-Haddad wrote on Twitter, according to Reuters.

El-Haddad said early Thursday that the Muslim Brotherhood would remain "non-violent" in their demonstrations, but later took a different stance, saying that the group has been having a difficult time trying to persuade its members to be peaceful in the wake of Wednesday's bloodshed.

"After the blows and arrests and killings that we are facing emotions are too high to be guided by anyone,'" he told Reuters. "It's not about Morsi anymore. Are we going to accept a new military tyranny in Egypt or not?'"

El-Haddad added that Muslim Brotherhood currently can not account for the whereabouts of several of its leaders, calling it a "very strong blow," to the group.

Read more here.