Smoke clung to the skyline in Homs and just as it appeared to be clearing, another explosion --- as activists reported government forces were intensifying their assault on the city.<br/> <br />Reuters cannot independently verify the content of this video, which was posted to a social media website.<br/> <br />The heaviest shelling was directed at a part of Homs inhabited mostly by Sunni tribal families and there are reports that rebel outposts in Rastan and other parts of central Syria are also under heavy fire.<br/> <br />UN efforts to bring peace to Syria - where a 15-month-old uprising against Assad has turned increasingly violent - have largely come to nothing.<br/> <br />In Geneva, a spokesperson for mediator Kofi Annan expressed concerns that locals could be trapped in targeted areas.<br/> <br />Ahmad Fawzi.<br/> <br />SOUNDBITE: Kofi Annan's Spokesperson, Ahmad Fawzi saying:<br/> <br />"Mr. Annan is particularly worried about the recent shelling in Homs as well as reports of the use of mortar, helicopters and tanks in the town of al-Haffeh in Latakia."<br/> <br />Activists say at least 35 people were killed on Monday.<br/> <br />Deborah Gembara, Reuters.
