According to evaluations, some 120 people of 200 dead were soldiers in President Bashar Assad 's army.
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The anti-Assad Aleppo Media Center distributed videos shot by rebels, showing the facility of the police academy completely destroyed by rocket hits, shooting and fire.
A black flag is seen in the video, over one of the building of the academy, and a torn poster of President Assad.
Meanwhile, Mouaz al-Khatib, the chief of the Syrian National Coalition has, for the first time, visited rebel-held areas near the embattled city of Aleppo in northern Syria.
Al-Khatib met Sunday with Syrians living in two suburbs of Aleppo that are controlled by the opposition.
The opposition controls large swathes of land around Aleppo, and several areas within the city while the government maintains controls of others.
The UN believes some 70,000 have been killed since the uprising against Assad began in March 2011.
AP contributed to this report
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