Syria crisis: Army steps up shelling in Homs
Heavy artillery fire has been rocking Homs, as Syrian troops step up an assault on the western city.
Activists say a field clinic is being targeted in one of the fiercest assaults on the city in the 11-month uprising.
Meanwhile, Russia and China defended their veto of a UN draft resolution criticising Syria - a move that angered opponents of President Bashar al-Assad.
Our correspondent Jim Muir has been watching the latest developments in Syria from neighbouring Lebanon.