Government tanks line the streets of what activists say is the Syrian city of Deir al-Zor.<br/> <br />Seconds later - a shell smashes into this apartment building - sending up a cloud of smoke.<br/> <br />The video, posted to a social media website, could not be independently verified by Reuters.<br/> <br />But it suggests that Syria's civil war - now in its 18 month - is not letting up.<br/> <br />Another amateur video apparently shows a massive fire in the outskirts of Deir al-Zor.<br/> <br />Activists say this is the aftermath of an airstrike on an oil pipeline.<br/> <br />Syrian state television also reported pitched battles in Aleppo, the country's commercial hub.<br/> <br />More than 30,000 people have died since the anti-government uprising began last year.