Peter Beaumont reports from Tahrir square. In an audio interview he talks about possible preparations by the army to crackdown against the protesters. Water cannons have been moved in and tanks have been split into two columns, he says.
"The mood amongst the people, who were very positive towards the army, does seem to be changing. People are very very suspicious of the army now. They want to know why a squadron of Egypt's best tanks is sitting in the entrance to square," he said.