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A rebel fighter part of the Jabhat Fatah al Sham, attends military training in the besieged rebel held Aleppo, Syria.

The Syrian Observatory for Human Rights said that all were members of Jabhat Fateh al-Sham, formerly the Nusra Front.

An air strike killed more than 40 members of the jihadist group Jabhat Fateh al-Sham in northwestern Syria on Thursday night, the Syrian Observatory for Human Rights said.

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The group, formerly known as the Nusra Front, could not immediately be reached for comment.

The London-based Observatory said the air strike had targeted a Fateh al-Sham base in a rebel-held area west of Aleppo, and it was not clear if it had been carried out by Russian or U.S. planes. The Nusra Front renamed itself Fateh al-Sham last year when it said it formally dissolved ties to al Qaeda.