More amateur video clips posted on social media website showed Homs being attacked by rocket and mortar fire.
The video, which Reuters cannot independently verify, showed members of the anti-government Free Syrian Army attacking a military checkpoint.
While another showed men running towards a house on fire.
British Prime Minister David Cameron, meeting with eight other European prime ministers in Sweden, said tough response is needed.
(SOUNDBITE)(English) BRITISH PRIME MINISTER DAVID CAMERON SAYING:
"It really is appalling, the scenes of destruction in Homs and it is quite clear that this is a regime that is hell-bent on killing, murdering and maiming its own citizens. So I think we need to take the toughest possible response we can, a tough response at the United Nations, which we have, and I was very disappointed obviously by the Russian and Chinese vetoes."
The Syrian Human Rights Organisation said this week's assault on Homs had killed at least 200 civilians.
International officials have estimated the overall death toll in Syria since last March at more than 5,000.
Sophia Soo, Reuters.
