Abu Seif Checheni was killed during clashes in militants’ attack to Aleppo’s central prison.

Earlier on Thursday evening, Syrian Army troops killed dozens of militants affiliated with the al-Qaeda group of al-Nusra Front in Aleppo.

Abu Seif Checheni, generally known as the most dangerous member of al-Nusra Front, was reportedly involved in the slaughter of many civilians and government soldiers across Syria.

Over the past few days, Syrian forces have killed scores of Takfiri militants - mostly foreign mercenaries - in Aleppo.

Syrian troops retook Friday most of Aleppo's prison, lost to militants a day earlier.

The fate of hundreds of prisoners reportedly freed after the attack was unclear, with suggestions that they may not have been able to flee amid the fighting.

NJF/NJF