A flash of a shell...<br/> <br />.. and an explosion in what amateur video says is a district of Aleppo in Syria.<br/> <br />Reuters cannot independently verify the content of these videos posted on to the internet because of government media restrictions.<br/> <br />But a number allegedly filmed on Saturday show fighting intensifying around the country.<br/> <br />Rebel fighters here in a province of Homs say they are clearing the area of Hezbollah fighters and have managed to kill some, though Hezbollah has denied sending fighters to government forces.<br/> <br />Meanwhile, an injured rebel fighter is carried away on a makeshift stretcher.<br/> <br />Scenes like these prompted a strong condemnation of the U.N. Security Council's 'inaction' by Turkish Prime Minister Tayyip Erdogan at a conference in Istanbul.<br/> <br />Turkey has led calls for intervention which have repeatedly been opposed by veto-wielding members Russia and China.<br/> <br />Erdogan called for structural changes within the organisation - and warned that it was repeating mistakes which allowed a massacre in Bosnia almost two decades ago.