Amateur video out of Syria shows tanks on the streets of Homs amid the sound of gunfire.<br/> The video, which could not be independently verified by Reuters shows a building under attack.<br/> Activists say Syrian tanks pounded an old district in the city killing three people.<br/> More footage appears to show demonstrators shouting at solders from the doorway in a mosque. They seek refuge inside.<br/> The attacks persist.<br/> One man is injured.<br/> Others seek to help him as gunfire echoes through the mosque.<br/> Activists and residents say Syrian forces killed 40 civilians Friday in one of the bloodiest days of the seven-month-old uprising against President Bashar al-Assad.<br/> The United Nations says 3,000 people, including nearly 200 children, have been killed since the uprising began in March.<br/> More footage out of Damascus shows a funeral march.<br/> Since the start of protests in March, Syrian authorities have blamed the violence on gunmen they say have killed 1,100 soldiers and police.<br/> Syria has barred most international media, making it hard to verify accounts from activists and authorities.<br/> Friday's violence prompted Arab ministers to issue their strongest call yet on Assad to end the killing of civilians.<br/> Arab ministers are due to meet Syrian officials to press for dialogue between the government and opposition<br/> Deborah Lutterbeck, Reuters
