Explosions rip through the Syrian city of Homs.br br Video uploaded to a social media site on Wednesday purportedly shows government forces shelling the rebel bastion, despite a ceasefire.br br Reuters cannot independently verify the footage.br br The 7-day old truce, agreed to by President Bashar al-Assad, held in some parts of the country and is being monitored by a handful of U.N. peacekeepers.br br However, activists and rebels claim cities like Hama, Idlib and Deraa are still under heavy fire and shelling.