Egypt's government and military are on a collision course tonight. President Mohamed Morsi refused to quit hours before an army ultimatum expires as deadly violence rocked Cairo during mass protests demanding he resign, in Egypt's worst crisis since its 2011 revolution.
In a televised address, the embattled Islamist leader said he had been freely elected to lead the troubled nation little more than a year ago and intended to stick to his task.
The only alternative to respecting the constitutional legitimacy of the office was further bloodshed on the streets, he warned, adding that he stood ready to "give my life" to defend constitutional legitimacy.
Only hours after Morsi's speech, the health ministry reported that unidentified gunmen had killed 16 people and wounded about 200 more after opening fire on a rally by his supporters in Cairo.
SBS Correspondent Brett Mason is in Cairo as the clock ticks down.
WATCH: BRETT MASON REPORTS FROM TAHRIR SQUARE
ALMOST 100 WOMEN SEXUALLY ASSAULTED IN CAIRO: HRW
Close to 100 women have fallen victim to "rampant" sexual attacks in Cairo's Tahrir Square during four days of protests against Egypt's Islamist President Mohamed Morsi, Human Rights Watch said on Wednesday.
"Mobs sexually assaulted and in some cases raped at least 91 women in Tahrir Square... amid a climate of impunity," HRW, which is based in New York, said in a statement.
It cited figures from the Egyptian Operation Anti-Sexual Harassment/Assault, which runs a hotline for victims of sexual assault, showing that there were 46 such attacks against women on Sunday, 17 on Monday and 23 on Tuesday.
Another women's rights group, Nazra for Feminist Studies, reported that there were another five attacks on Friday, said HRW.
The watchdog called on Egyptian officials and political leaders "across the spectrum to condemn and take immediate steps to address the horrific levels of sexual violence" in the iconic square.
"The rampant sexual attacks during the Tahrir Square protests highlight the failure of the government and all political parties to face up to the violence that women in Egypt experience on a daily basis in public spaces," said Joe Stork, HRW's deputy Middle East director.
"These are serious crimes that are holding women back from participating fully in the public life of Egypt at a critical point in the country's development."
Several women required surgical intervention after the attacks, some were "beaten with metal chains, sticks, and chairs, and attacked with knives," HRW said.
