The Yazidi girls were far from home when the Iraqi army rescue boats picked them up, starved and confused, from the banks of the Euphrates.

Unlike the hundreds of others escaping the city of Fallujah this week, Nadia and Mona were not residents.

The women are from Sinjar, more than 300 miles away in Iraqi Kurdistan.

They had been captured, along with 5,000 other Yazidi women and children, by Islamic State militants when they overran their towns in the summer of 2014, purging the minority they consider to be devil worshippers.

For the last two years the pair, aged 22 and 23, have been held as sex slaves; bought, sold and passed around senior Isil jihadists.