Amateur video out of Syria appears to show a tank on the streets of Douma.
The video, which could not be independently verified by Reuters, shows a Syrian soldier firing his weapon. Smoke can be seen rising as a fire rages behind a mosque.
More footage, purportedly from Homs shows a car burning in the streets. Parts of the town now stand in ruins.
A popular uprising against President Bashar al-Assad began in March 2011 with peaceful demonstrations for democracy. Now some fear it is developing into something close to civil war.
Major powers are now working towards holding a crisis meeting in Geneva on June 30 in an effort to try to get a tattered peace plan back on track.
All sides signed up to a UN-backed peace plan. But an April 12 ceasefire has been widely violated, prompting many observers to say the plan has failed.
Deborah Lutterbeck, Reuters