BBC journalist pays tribute to Colvin

Two Western journalists - Marie Colvin of the Sunday Times and French photographer Remi Ochlik - have been killed in the Syrian city of Homs.

Activists say they were killed when the house from where they were reporting in the Baba Amr district was shelled by Syrian government forces.

The BBC's Jim Muir, a friend of Marie Colvin, gave his reaction from Beirut.

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