of al-Karmid, at Jabal al-Zaweya, in Idlib province, Syria, Wednesday, Feb. 27, 2013. Syrian warplanes carried out airstrikes on rebels trying to storm a police academy outside Aleppo on Wednesday, while jihadi fighters battled government troops along a key supply road leading to the southeastern part of the city, activists said. (AP Photo/Hussein Malla)
/ AP

A Free Syrian Army fighter from the Knights of the North brigade moves to reconnaissance a Syrian army forces base of al-Karmid, at Jabal al-Zaweya, in Idlib province, Syria, Wednesday, Feb. 27, 2013. Syrian warplanes carried out airstrikes on rebels trying to storm a police academy outside Aleppo on Wednesday, while jihadi fighters battled government troops along a key supply road leading to the southeastern part of the city, activists said. (AP Photo/Hussein Malla)—AP

A Free Syrian Army fighter from the Knights of the North brigade moves to reconnaissance a Syrian army forces base of al-Karmid, at Jabal al-Zaweya, in Idlib province, Syria, Wednesday, Feb. 27, 2013. Syrian warplanes carried out airstrikes on rebels trying to storm a police academy outside Aleppo on Wednesday, while jihadi fighters battled government troops along a key supply road leading to the southeastern part of the city, activists said. (AP Photo/Hussein Malla)
/ AP

BEIRUT 
Syrian rebels clashed with regime troops in the narrow stone alleyways around a historic 12th century mosque in the Old City of Aleppo on Thursday, while a government airstrike north of the city killed at least seven people, activists said.

The rebels, who have been slowly chipping away at the regime's hold on Aleppo,