Doctors in a Cairo hospital say two people have died from bullet wounds after the army tried to clear demonstrators from Tahrir Square on Friday night. They say a further 15 were wounded.
Protesters have vowed to stay put until former president Hosni Mubarak is brought to trial and other demands are met.
An army spokesman denied live rounds had been fired, claiming only blanks were fired in the air to warn demonstrators.
The Military Council has been broadly supported since it took control but unease is growing and more questions are being asked.
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