Egyptian police and soldiers firing guns and teargas fought to clear protesters from Cairo's Tahrir Square on Tuesday, the fifth day of clashes that have killed 13 people and drawn a stinging rebuke from U.S. Secretary of State Hillary Clinton.

Clinton condemned as particularly shocking incidents such as one in which two Egyptian soldiers were filmed dragging a woman protester on the ground by her shirt, exposing her underwear, then clubbing and kicking her.

Women protesters have been rounded up and subjected to horrific abuse. Journalists have been sexually assaulted. And now, women are being attacked, stripped, and beaten in the streets, America's top diplomat said in a speech at Washington's Georgetown University on Monday, adding:

This systematic degradation of Egyptian women dishonours the revolution, disgraces the state and its uniform and is not worthy of a great people.

The United States, which saw Cairo as a staunch ally in the era of deposed leader Hosni Mubarak, gives Cairo $1.3 billion a year in military aid, a commitment that began after Egypt in 1979 became the first Arab state to make peace with Israel.

Clinton's remarks, some of the strongest criticism by a U.S. official of Egypt's new rulers, ratchet up pressure on the army. But Western diplomats said it was unlikely Washington would use its hefty aid as leverage. U.S. officials have so far praised the army for committing to hand power to civilians.

A staggered parliamentary election is under way and the army has pledged to hand power to an elected president by July.

In a statement, the ruling army council called for an end to all manifestations of violence and said the law should be upheld while respecting the dignity of the Egyptian citizen, men and women.

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Clinton, who had earlier called on Egypt's security forces to respect human rights, said women had been mostly shut out of decision-making by the ruling army and by big political parties.

Women are being beaten and humiliated in the same streets where they risked their lives for the revolution only a few short months ago, she said.

Thousands of men and women marched to Tahrir over that and other incidents, chanting: The women of Egypt are a red line.

GUNFIRE AT DAWN

General Adel Emara, a member of Egypt's army council that took over after Mubarak was overthrown in February, said on Monday the attack on the woman protester was an isolated incident that was under investigation.

Gunfire rang out across Tahrir Square at dawn as security forces charged hundreds of protesters attempting to hold their ground, activists and a Reuters journalist at the scene said.

After a night of clashes, hundreds of protesters demanding an immediate end to army rule were in Tahrir in the morning.

Medical sources say 13 people have been killed and hundreds wounded in the violence that began on Friday in Tahrir and nearby streets leading to parliament and the cabinet office.

Army generals and their advisers have condemned the pro-democracy protesters, sometimes in extraordinarily harsh terms.

What is your feeling when you see Egypt and its history burn in front of you? retired general Abdel Moneim Kato, an army adviser, told al-Shorouk daily, referring to a government archive building set alight during clashes. Yet you worry about a vagrant who should be burnt in Hitler's incinerators.

Those comments drew fierce criticism from politicians and rights groups, saying they would stir further violence.

The least that can be said about such comments is they are irresponsible and he must be punished for them, publicly and transparently, the Arab Network for Human Rights said, adding that his Nazi opinions, incite hatred, and justify violence.

General Emara said evil forces wanted to sow chaos and that soldiers had shown self-restraint despite provocation.

What is happening does not belong with the revolution and its pure youth, who never wanted to bring down this nation, he said. Despite the actions of the security forces in Tahrir, Emara denied that the army had given orders to clear the square.

BLOODY MAYHEM

Hard-core activists have camped in Tahrir since a protest against army rule on November 18, which was sparked by the army-backed cabinet's proposals to permanently shield the military from civilian oversight in the new constitution.

A week of mayhem in November killed 42 people.

U.N. Secretary-General Ban Ki-moon has criticised the use of excessive force by the Egyptian authorities. Rights groups said suppliers should not send small arms to Egypt.

The flare-up has also marred a staggered parliamentary election that began on November 28 and ends on January 11, but the army has said a promised transition to civilian rule will go ahead.

Results so far suggest the once-banned Muslim Brotherhood and hard-line Salafi Islamists will dominate the lower house, groups the West once looked to Mubarak to keep in check.

Washington has reached out to Islamists in a shift in approach since the summer. A senior U.S. diplomat met Islamist and other newly elected members of parliament in the northern city of Alexandria, the embassy said on Tuesday.

Before the latest charge by the security forces in Tahrir, protesters had been trying to tear down a brick wall the army had put up to block access to parliament, located nearby.

Hundreds of state security forces and the army entered the square and began firing heavily. They chased protesters and burned anything in their way, including medical supplies and blankets, said a protester who gave his name only as Ismail.

Some of those who fell had gunshot wounds to the legs, he added, speaking by telephone from Tahrir.

Politicians and members of parliament who had been staging a sit-in nearby tried to enter the square but were forced to turn back as the gunfire and clashes raged on, Ismail said.

The violent crackdown has alarmed rights groups. Amnesty International urged arms suppliers to stop sending small arms and ammunition to Egypt's military and security forces.

Reporters Without Borders complained of the army's systematic use of violence against media personnel.

(Additional reporting by Shaimaa Fayed and Dina Zayed; Writing by Edmund Blair; Editing by Alistair Lyon)