France preparing for return of homegrown IS militants

France said on Tuesday that it is preparing for an influx of homegrown jihadis returning home, as the departure of American troops from Syria looms.

In an interview with BFM television, Interior Minister Christophe Castaner said that a handful of French jihadis had already returned and more would follow soon. Neither he nor France's foreign ministry confirmed BFM's report that as many as 130 could come back within weeks.

"The Americans are leaving Syria. It's important to keep that in mind," Castaner said. "There are a certain number who are imprisoned because the Americans are there, and they will be freed. They will want to return to France."

The question of what to do with foreigners who joined the Islamic State group has grown an increasingly thorny issue as the US departure looms.

French jihadis made up the largest contingent of European recruits, and in 2015 and 2016 an Islamic State group cell of French and Belgian fighters who sneaked in from Turkey attacked Paris and Brussels.

The UK refuses to take back citizens who joined the group and has stripped them of their citizenship. Other European countries have remained largely silent about the fate of men and women whom many see as a security threat.

"These are people who have voluntarily joined a terrorist organisation... that has committed attacks in France and continues to threaten us," France's foreign ministry said.

Castaner said all would be jailed immediately in France and face trial, but declined to provide details.

Kurdish authorities in Syria have detained 900 foreign members of the group, and 4,000 family of IS members, according to Ilham Ahmed, a senior Syrian Kurdish official.

Russia has taken some of the recruits back and jailed them.

The Syrian Observatory for Human Rights said there are at least 78 French women and children who had recently come out of the last stronghold of IS in eastern Syria.

This is in addition to another 65 previously evacuated from other IS held areas and in Kurdish custody. It was not clear if Castaner was also speaking of civilians and families of IS members.

Castaner said a small number had already returned to France, although it's not clear whether they had voluntarily surrendered or were repatriated, or whether he meant fighters or their families.

The Syrian Observatory for Human Rights said at least 78 French women and children recently left the last stronghold of IS in eastern Syria.

This is in addition to another 65 previously evacuated from other IS held areas and in Kurdish custody.