Damberg believes that the agreement with the UN agency UNITAD on cooperation in gathering evidence will be a "powerful mechanism" for getting IS terrorists convicted, he also points out that there is no statute of limitations for war crimes, genocide and crimes against humanity.

IS supporters have left behind large amounts of material in Iraq, such as abandoned archives and mobile phones.

UNITAD collects and categorizes the information and also collects information from witnesses and victims of crime, and assists in the opening of mass graves.

- I think we will be able to find more evidence, says Damberg.

He states that "a handful" of investigations with Swedish connections are currently underway.

- Usually these investigations take a long time, so I would not be surprised if we get more with time.

No one can go safe, says Damberg.

He recalls that after genocide and war crimes in Rwanda and the former Yugoslavia, it took several years before evidence emerged, but in the end perpetrators could be convicted, even in Sweden.

Can be used here

UNITAD was established in 2017 to support national efforts to hold IS accountable for war crimes, crimes against humanity and genocide in Iraq.

This will be done by collecting and preserving evidence that can be used in national trials, primarily before a court in Iraq.

But the evidence can also be handed over to law enforcement agencies in other countries.

- Should it be the case that any person who is in Sweden and has committed this type of crime, we can also use the evidence in Swedish courts, says Damberg

Swedish citizens cannot be extradited to countries outside the EU and the Nordic countries.

On the other hand, non-Swedish citizens who are in Sweden can if a court decides that there is no obstacle to extradition.

Such an obstacle could be the risk of the death penalty.

Easier to get proof

Sweden is already cooperating with UNITAD today, but the new agreement will facilitate that cooperation, for example by establishing contact points for the exchange of information with the Police and the Public Prosecutor's Office.

UNITAD is also working with the Iraqi government to help Iraq enact legislation to set up special courts to try people with links to IS for the crimes of genocide, crimes against humanity and war crimes.

It is a work that the Swedish government supports.

Hear SVT's Middle East correspondent Stina Blomgren about the agreement in the clip above.