Still from unverified amateur footage purportedly shows smoke rising from a thirteenth century mosque hit by shells in Homs
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Syria conflict: Air strikes shake 'crucial' city of Homs

29 June 2013 Last updated at 21:38 BST

Syrian government war planes and ground forces have struck at rebel-held districts in the city of Homs, including Khalidiya and Jouret al-Shiya, activists say.

Aircraft, tanks and mortar units attacked the city in "one of the most violent days... since the beginning of the revolution", an activist told the AP news agency.

Kevin Connolly reports.

Syria conflict