"It's warplanes against Kalashnikovs, tanks fighting against rifles," he said. "I don't know how long this situation can be sustained."
Syrian troops bomb rebel positions in Aleppo →
"The warplanes and helicopters are killing us, they're up there in the sky 15 hours a day," said Mohammad al-Hassan, an activist in Aleppo's main rebel stronghold of Salaheddine.
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