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Free Syrian Army fighters plant a roadside bomb to strike a tank

Rodrigo Abd / AP

Free Syrian Army fighters plant a roadside bomb to destroy a Syrian Army tank during a day of fierce fighting with the government forces in Idlib, north Syria on Sunday.

Rodrigo Abd / AP

Free Syrian Army fighters are seen amid smoke from tank shelling in Idlib. At least four rebels were killed and several were injured when the tank shell landed.

Rodrigo Abd / AP

A Free Syrian Army fighter calls for reinforcements as they take cover on a corner in Idlib.

Rodrigo Abd / AP

Free Syrian Army fighters cry after learning at least four comrades died during clashes with the government forces in Idlib.

Rodrigo Abd / AP

Aida cries as she recovers from severe injuries after the Syrian Army shelled her house in Idlib north Syria. Aida's husband and and two children were killed after their home was shelled.

From a Reuters story quoting special envoy Kofi Annan describing 'grave and appalling reports of atrocites' in Syria:

The United Nations estimates Syrian security forces have killed well over 7,500 people. The government says foreign militants are behind the unrest and are responsible for the death of more than 2,500 security forces.

The head of the United Nations urged President Bashar al-Assad to respond within the next few days and called military operations against a year-long uprising "shameful."

"The Syrian government has failed to fulfill its responsibility to protect its own people and instead has subjected its citizens in several cities to military assault and disproportionate use of force," said Secretary-General Ban Ki-moon. "These shameful operations continue."