The wife of French extremist Jean-Michel Clain told AFP Tuesday that her husband was killed last month in Syria after a coalition strike killed his brother Fabien, another notorious extremist.
Dozens of displaced people with Islamic state fighters among them evacuated from Baghouz - the last town still under the control of Islamic State group.
Hundreds of people left the last area held by Daesh (ISIS) in Syria Tuesday where they gathered in a massive reception area to be searched and screened by USA -backed fighters.
Adnan Afrin, spokesman and commander for SDF, told CNN that "more than 6,000 people have fled or left Baghouz within the past 48 hours and more are expected to arrive to the reception areas".
In a statement released on Monday, the US-backed Syrian Democratic Forces (SDF) said it released at least 283 Syrians suspected of having ties to IS. The delay was prompted by concerns over the deaths of civilians being used as human shields by Islamic State fighters.
Under the banner of "cooperation, fraternity and clemency", the SDF said it made a decision to release the IS prisoners following negotiations with tribal leaders who had fought against IS militants.
"Slowing the offensive in Baghouz yesterday, we managed to evacuate about 3,000 [people]".
Diehard jihadists are fiercely defending their last patch after the SDF and the US-led coalition resumed their offensive late Friday, following a two-week pause to allow for civilian evacuations. The SDF said its fighters were surprised by the number of civilians, who include IS family members, cooped up in the small area that has been squeezed smaller and smaller by intermittent military offensives.
On Sunday, black smoke billowed over the besieged speck of land in the village after airstrikes hit several targets. But he died in a mortar attack two days later.
Around 15,000 people reached the Al Hol camp from Baghouz between February 22 and March 1, the United Nations humanitarian coordination office OCHA said on Monday.
In the years since its peak, the group's annual revenue has more than halved: from up to $1.9 billion in 2014 to a maximum of $870 million in 2016, according to a recent report by the International Centre for the Study of Radicalisation and Political Violence at King's College London.