"We need to work things out with the Iraqi authorities so that we can find a way to have a judicial mechanism that is able to judge all these fighters, including obviously the French fighters," he told BFM-TV.

Prime Minister Edouard Philippe later said Le Drian would head to Iraq "as soon as tonight" to work on potential means for trying detained insurgents.

"A certain number of those held in Syria by the Kurds committed crimes in Iraq, which means that they can be held accountable there," he said.

Seven European countries -- France, Britain, Belgium, Germany, the Netherlands, Sweden and Denmark -- have been discussing in recent months the creation of an international court in Iraq for putting foreign Islamic State (IS) jihadists on trial.

Officials from all seven countries took part in a technical mission to Baghdad to assess the situation.

They said they had learned from the Iraqi authorities about "the daunting task they are facing in bringing Daesh to justice and rebuilding the society."

A major issue will be Iraq's use of the death penalty, which is outlawed throughout the EU.

Hundreds of foreigners have been sentenced to death or life imprisonment in Iraq for belonging to IS.

A dozen French jihadists held by Kurdish forces in northern Syria were already handed over to the Iraqi authorities at the end of January to be put on trial, though Le Drian said further transfers were not planned at the moment.

Eight French citizens have been sentenced to death in Iraq but none of the executions have been carried out.

The technical mission said it had reiterated opposition to the death penalty "in all places and in all circumstances" to the Iraqi authorities.

There have been concerns that the Turkish offensive in northern Syria targeting Kurdish forces could lead to a mass prison breakout of jihadists captured by the Kurds.

But Le Drian said the security of Kurdish-run prisons holding suspected jihadists in northern Syria was "currently" not threatened by the Turkish military operation.

"To my knowledge, the Turkish offensive and the positioning of the SDF (Syrian Democratic Forces) have so far not led to the safety and security of these camps... currently being threatened," he said.

Turkey on Monday accused Kurdish forces of deliberately releasing IS prisoners held at a prison in the Syrian border town of Tal Abyad "in an attempt to fuel chaos in the area".

Kurdish officials claimed that Turkish bombardments had allowed nearly 800 relatives of foreign IS fighters escape from a camp for the displaced.