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Rebel fighters drive a tank near the frontline in the village of Ratyan in the countryside north of the Syrian city of Aleppo on February 19, 2015. Fierce clashes are raging between rebel forces and government troops in the villages of Ratyan and Hardtaneen as regime forces cut the main rebel supply line into Aleppo. The Syrian regime is ready to suspend aerial bombardment of Aleppo to allow a humanitarian ceasefire, a UN envoy said, even as government troops sought to encircle embattled rebels. AFP PHOTO / ZEIN AL RIFAIZEIN AL-RIFAI/AFP/Getty Images
Rebel fighters drive a tank near the frontline in the village of Ratyan in the countryside north of the Syrian city of Aleppo on February 19, 2015. Fierce clashes are raging between rebel forces and government troops in the villages of Ratyan and Hardtaneen as regime forces cut the main rebel supply line into Aleppo. The Syrian regime is ready to suspend aerial bombardment of Aleppo to allow a humanitarian ceasefire, a UN envoy said, even as government troops sought to encircle embattled rebels. AFP PHOTO / ZEIN AL RIFAIZEIN AL-RIFAI/AFP/Getty Images

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    Syria civil war: Fighting rages outside Aleppo

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Syria civil war: Fighting rages outside Aleppo

CNN's Michael Holmes reports on heavy clashes near Aleppo between rebels and pro-regime forces.

Syria civil war: Fighting rages outside Aleppo

CNN's Michael Holmes reports on heavy clashes near Aleppo between rebels and pro-regime forces.