UPDATE: 3:56 p.m.: State Department spokeswoman Jen Psaki said in a press briefing Thursday that the United States will review aid to Egypt “in all forms.” She also condemned “reprehensible attacks” on Coptic churches that haven taken place in recent days as well as attacks against public buildings in Egypt.

Meanwhile, the Egyptian Health Ministry has raised the number of dead from Wednesday’s violence to 638.

UPDATE: 1:22 p.m.: Secretary of Defense Chuck Hagel has called Egypt’s Defense Minister, Gen. Abdul-Fattah el-Sisi, to tell him that the violence is putting defense ties at risk.

UPDATE: 12:00 p.m.: Egypt has authorized police to use deadly force to defend themselves and key institutions from attacks.

UPDATE: 9:49 a.m.: State TV reports that the military has pledged to rebuild the burnt-out Rabaa mosque and other buildings destroyed in yesterday’s violence — including the number of churches attacked. (The Egyptian military has huge financial resources of its own over and above public funds, because of its huge business interests.)

UPDATE: 8:42 a.m.: The official death toll has now risen to 525, with 3,700 injured and 43 police officers among the dead.

Below are scenes after the clashes from the area where the Muslim Brotherhood had encamped in Cairo, outside the Rabaa mosque:

Muslim Brotherhood protesters have stormed a government building in Giza and set it on fire:

UPDATE 4:21 p.m.: The Egyptian Health Ministry has raised the civilian death toll to 235. It had previously said it was 149. Meanwhile, the Muslim Brotherhood says 2,600 people have been killed.

UPDATE 3:42 p.m.: According to NBC chief foreign correspondent Richard Engel, who is on the ground in Egypt, reports that the country’s Interior Ministry says 43 security forces have been killed, including 18 police officers, and 211 injured. Twenty-one police stations were attacked during the day’s violence as well.

UPDATE 3:22 p.m.: Several outlets are reporting that Egyptian authorities have arrested a number of Muslim Brotherhood leaders.

UPDATE 3:13 p.m.: Senator Lindsey Graham, who was recently in Egypt with colleague John McCain, warned that the Egyptian military needs to be careful not to overplay its hand and risk heightening tensions with Morsi supporters.

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UPDATE 12:50 p.m.: An Egyptian blogger notes that protesters have set fire to churches, primarily in Upper Egypt where Muslim Brotherhood support is still strong.

UPDATE: 12:22 p.m.: Egypt’s interim president Adly Mansour has issued a month-long state of emergency for the country following today’s violent outbreaks.

Egypt previously had a state of emergency lasting 31 years after the assassination of Anwar Sadat; it was lifted last year following the ouster of former president Hosni Mubarak

12:12 p.m. Several sources have confirmed that Egypt’s acting vice president Mohamed ElBaradei, a well-known liberal, Nobel laureate, and former chief of the International Atomic Energey Agency, has resigned in the midst of deadly clashes between security forces and supporters of former president Mohamed Morsi. ElBaradei stated he resigned because he “could not bear responsibility for decisions I disagreed with,” adding that there were “more peaceful means” to solve the crisis.

As it stands now, the government’s health ministry says 149 people have been killed and 1,403 have been wounded across the country since violence broke out earlier today, though the exact numbers of casualties remain unclear. Morsi supporters are saying the number is higher, saying as many as 2,000 have been injured. Violence erupted when government forces raided pro-Morsi encampments in an effort to dispel the ongoing protests.

Speaking from Martha’s Vineyard where President Obama is vacationing, a White House spokesman said that the United States condemns the violence in Egypt