Heavy smoke and gunfire in Homs. The video posted to a social media website purports to show security forces storming and shelling the city. Activists say that several people several people have been killed in a government crackdown.br In Nahir Asha near Damascus, security forces can be seen arresting a young boy and leading a woman away from a building.br Reuters cannot independently verify the content of videobr At least 20 people were killed in clashes across Syria on Wednesday.br Deborah Gembara, Reuters.