The international coalition fighting the "Islamic State of Iraq and Syria" (ISIS) in Syria confirmed Thursday (February 28th) the death of a notorious French extremist who was killed in an airstrike last week.

Fabien Clain, who is believed to have gone to Syria in March 2015, was killed in a strike in the terror group's last Syrian redoubt of al-Baghouz, the coalition said in a statement.

French sources a week ago told AFP that Clain had been killed.

Clain gained notoriety after voicing an audio recording claiming responsibility for the November 2015 attacks in Paris, when ISIS gunmen slaughtered 129 people in co-ordinated attacks at restaurants and bars around the French capital, at the Bataclan concert hall, and the national stadium in an atrocity that stunned the world.

In his video afterwards, Clain can be heard announcing that "eight brothers wearing explosive belts and carrying assault rifles" had conducted a "blessed attack on... Crusader France".

The chilling propaganda recording warned that the extremist rampage was just "the beginning of the storm".

In 2009, Clain was found guilty and sentenced to five years in prison for helping send extremists to fight US forces in Iraq, before leaving himself to live in ISIS's self-proclaimed proto-state six years later.

His brother Jean-Michel, also an extremist, was wounded in the same raid in al-Baghouz, where the last ISIS fighters are holding out against the Syrian Democratic Forces (SDF), French security sources earlier told AFP.