Story highlights Spokesman for al-Nusra Front killed in airstrike, monitoring group says

London-based SOHR says Abu Firas al-Suri was killed alongside 20 others Sunday

(CNN) An airstrike in Syria has killed the spokesman for al Nusra Front according to a monitoring group.

Abu Firas al-Suri the voice of the al Qaeda affiliated militant group that also is known as Jabhat al Nusra, died Sunday, the London-based Syrian Observatory for Human Rights, or SOHR, said.

Suri was killed alongside his son and at least 20 other al-Nusra fighters, northwest of Idlib in northwestern Syria, SOHR reported.

It was unclear whether Syrian or Russian aircraft launched the strike, it said.

Damascus-born