A 15-year-old Swedish girl who ran away with her boyfriend to join ISIS has been rescued for a second time, in a raid carried out in Mosul, Iraq, by Kurdish special forces last week.

Marilyn Stefanie Nevalainen, from Boras, western Sweden was pregnant when she left her home country along with her 19-year-old ISIS-supporter boyfriend in May last year.

She was rescued from ISIS by Kurdish forces in late October, but escaped from her saviours to go back to her partner, and gave birth to a son days later, Swedish media reports.

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Marilyn Stefanie Nevalainen, from Boras, western Sweden was pregnant when she ran away from her foster home in April last year, along with her 19-year-old ISIS-supporter boyfriend

Ms Nevalainen was first reported missing in June by both her biological parents and her foster family, after tricking the latter that the former had allowed her to go to Stockholm for a few days.

She was last seen at a train station on May 31, where she and her 19-year-old boyfriend were dropped off by her foster family, where she had been living since February.

According to Swedish media, the couple had married in a Muslim ceremony in Stockholm in early 2015.

The couple reportedly travelled via Denmark and Bulgaria, before entering Syria via Turkey, and joined an ISIS-linked group on arrival.

The first attempt to free Ms Nevalainen was carried out at the end of October, when she was heavily pregnant, but the teenager somehow managed to return to her boyfriend near Mosul.

Back to ISIS: The teenager was rescued from ISIS by Kurdish forces in late October, but escaped from her saviours to go back to her partner, and gave birth to a son

TALES OF A TROUBLED TEEN: MARILYN NEVALAINEN'S BLOG Ms Nevalainen appears to have been an avid blogger in her pre- and early teens, and her musings tell the tale of a troubled young girl. In one post written at the tender age of 13, she writes about having meetings with social services, before announcing that she is going out for a smoke. In another, she appears to have been in trouble with the law, as she blogs ahead of a police interview. On Sunday, 22 December, 2013 she writes: 'Haha, gonna totally flip on these cop w****s tomorrow, I can feel it already. Don’t give a s*** about the s*** I'm gonna get, don’t regret anything of what I have done… Haha, kisses’ And in one post written just one year before her marriage to a strict Muslim ISIS fighter, she offers her opinions on drugs. 'As far as I’m concerned, I don’t think drugs are that bad. Not that I’ve tested everything there is, but still. In my opinon, the drugs you can smoke shouldn’t be called drugs! Because what do those drugs do exactly? Nothing! They just make you dopey as fuck – at least for me! 'I stick to dope if I’m doing drugs, so according to me, there’s nothing bad about drugs, as long as you know what youre doing, it’s chill!' Advertisement

A few days later, she gave birth to a son, whose whereabouts are not yet known, Aftonbladet reports

Ms Nevalainen has now claimed that she was 'misled' into running away from home by her boyfriend, an ISIS jihadist fighter who has since reportedly been killed in a Russian air strike.

The teenager was rescued in a raid by Kurdish special forces last week, the autonomous region's security council said in a statement on Tuesday.

The 16-year-old travelled from Sweden to Syria last year and then crossed the border into Iraq, where she was rescued near the Islamic State stronghold of Mosul on February 17 by forces from the Kurdish counterterrorism department, the statement added.

The Kurdish security council identified the rescued teenager as coming from the town of Boras and said she had been misled into making the journey to Syria by an Islamic State member in Sweden.

'The Kurdistan Region Security Council was called upon by Swedish authorities and members of her family to assist in locating and rescuing her from ISIS,' the statement read.

Ms Nevalainen, is currently in the Kurdistan region and will be handed over to Swedish authorities so she can return home once necessary arrangements are put place, it added.