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Amr Nabil, Associated Press
An Egyptian book restoration official arranges burnt pages of the original ancient copy identified as "Le Description de L'Egypt", (The Description of Egypt,) written by scientists who came with Napoleon Bonaparte's expedition to Egypt in the late 18th century, which were saved from the research center in Cairo, Egypt, Monday, Dec. 19, 2011. The building was almost completely gutted by a fire which broke out during the height of the clashes on Saturday, when troops on its roof and on other nearby rooftops hurled rocks down on protesters below.

CAIRO — Hundreds of Egyptian soldiers in riot gear swept through Cairo's Tahrir Square early Monday and opened fire on protesters demanding an immediate end to military rule. The Health Ministry said at least three people were killed, bringing the death toll for four days of clashes to 14.

Violence has been raging in Cairo since Friday, when military forces guarding the Cabinet building near Tahrir Square heavily cracked down on a 3-week-old sit-in to demand Egypt's ruling generals immediately hand power to a civilian authority.

The raid early Monday may have been an attempt by the military to keep protesters away from key government buildings near the square, including parliament and the Interior Ministry, which is in charge of the hated police force.

Ahmed Saad, a field hospital doctor who witnessed the crackdown, said six people were killed by gunshots, giving a toll twice that of the Health Ministry's. He said troops stormed a mosque on the square, beating up protesters who spent the night inside.

"It was like a rain of bullets in the early morning," Saad said.

The pro-democracy protesters have decried the military's heavy-handed crackdown. Activists have flooded social network sites and other media with photos and video of troops beating and attacking protesters.

Some widely circulated footage shows an army officer firing a pistol at protesters — though it is not clear whether he was using live ammunition. Other images show soldiers dragging women by the hair and ferociously beating, kicking and stomping on protesters cowering on the ground.

A member of the ruling military council on Monday defended the use of force against protesters, arguing that the events since Friday amounted to what he called an attempt to "topple the state." He harshly criticized the media's coverage of the violence.

"There is a methodical and prepared plot to topple the state, but Egypt will not fall," said Maj. Gen. Adel Emara.

He said the armed and security forces had a duty to protect the nation's installations and that they could not stand by while protesters tried to destroy state property.

"What are we supposed to do when protesters break the law? Should we invite people from abroad to govern our nation?" said Emara. He said an investigation into the clashes and the media's coverage of them was under way.

"The media is helping sabotage the state. This is certain," he said.

The military council took power 10 months ago after the popular uprising that forced longtime ruler Hosni Mubarak to step down.

In the middle of violence, a research center set up during France's three-year occupation of Egypt in the late 18th century caught fire and was gutted. On Monday, archive officials and dozens of volunteering protesters tried to salvage valuable books and documents from the center. The two-story building is in danger of collapsing after the roof caved in.

Inside the smoldering building, there were piles of burnt furniture, twisted metal and demolished walls. A double human chain by protesters surrounded the building to prevent any new attempts of sabotage.

Emara said protesters prevented fire engines from reaching the site to put out the fire.

The military has routinely denied the use of excessive force by its troops against protesters, including clashes last month that left more than 40 people killed. Its denials have been coupled with promises of investigations whose results have yet to be announced.