Shelling in the Syrian city of Homs
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UN warns of unprecedented violence in Syria

6 July 2012 Last updated at 01:08 BST

The United Nations has warned of unprecedented violence in Syria unless there is a negotiated solution.

The UN deputy envoy for Syria, Jean-Marie Guehenno, told the BBC that an agreement on political transition signed in Geneva by Security Council members was only a start and a long process of negotiation would follow.

The BBC's correspondent Paul Wood reports from Geneva.