Tensions high as Egypt prepares to vote for divisive referendum

Tensions are high in Egypt over a staggered referendum, which is being held on this and the following Saturday, after weeks of protests and violence between rival camps in Cairo. Further rallies by both sides were taking place in the capital on Friday, as Egypt's 51 million voters get ready to vote on the draft constitution backed by Islamists, including President Mohamed Morsi, but denounced by the secular opposition.Duration: 02:20