Blood stained floors and frantic activity. This video uploaded to a social media website purportedly shows the scene at makeshift health center after the shelling of a mosque in Homs.br br Nearby, damage to a local home.br br While Reuters cannot independently verify the content of this video, it comes amid reports that government forces killed at least 54 people.br br Activists say President Bashar al Assad's forces had intensified their crackdown on protests ahead of a visit by Kofi Annanbr br The U.N.-Arab League envoy is due to arrive in Damascus on Saturday.br br Deborah Gembara, Reuters.