“It is completely unacceptable that Swedish citizens are travelling to [join] IS, financing the organization, or fighting for it,” Justice Minister Morgan Johansson and Home Affairs Minister Anders Ygeman wrote in a joint article in the Dagens Nyheter newspaper.
The proposed ban would prohibit combat for terrorist organizations listed as such by the United Nations or European Union.
“We have a responsibility for what our citizens do both here at home and in other countries,” they wrote.
“People who live here and who have chosen to join IS can constitute a serious threat upon their return. Criminalization is of course not the only way of preventing this, but it is an important part of anti-terrorism measures,” they said.
Johansson told reporters at a press conference that he had commissioned a report on the possibility of introducing such legislation, which was to be submitted to the government in June 2016.
In a bid to stem the flow of foreign jihadists, the UN Security Council adopted a resolution last year requiring member states to adopt laws making it illegal to travel or make plans to travel to a country to join jihadist groups, or to collect funds for recruitment.
Johansson said Sweden hoped to present a separate bill to parliament in a few months that would meet the UN demands.
A government-commissioned report has proposed a maximum two-year prison sentence for those crimes.
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In April, Säpo told The Local there was “very little” it could do to stop people travelling to Syria to join al-Qaeda inspired groups, as EU officials estimated up to 6,000 people from across Europe have now fought in the war-torn nation.