Deadly Clashes in Egypt

Violent clashes erupted in Egypt overnight, killing more than 40 people, and injuring more than 300.

Witnesses say the Egyptian military fired on supporters of deposed President Mohamed Morsy.

Clashes between Morsy supporters and security forces took place before dawn and in front of the presidential guard headquarters. “This is where Mr. Morsy is reportedly being held in custody,” CNN's Reza Sayah reports from Cairo.

Reports conflict regarding who fired first, with the military placing the blame on the protesters, who deny being armed and claim the security forces fired on them.

“The aftermath was ugly, many of the victims rushed to a nearby hospital,” Sayah reports. “This is the deadliest incident since Mr. Morsy was ousted.”

Follow along at CNN.com as this story develops.