No one could get out -women, children and the elderly were stuck in the centre of a warzone. It soon became clear that these pro-Mubarak protesters were either plain-clothed policemen or had been paid by the government. "The scene is horrific," said Mona, a 24-year-old Egyptian based at a field hospital one street from the square (in normal life she's a cancer researcher). "We don't have any weapons, we have rocks. People are tearing up cars to use as shields. We can't leave, we can't move the injured."