The workshops are to be held over the next three days, after which the school breaks for the long summer holiday.

Israeli army radio said that when classes resume in autumn a privately-funded school outside the state education system would cater to the Slonim girls.

The fathers' imprisonment was marked by a rally of around 100,000 angry ultra-Orthodox Jews in Jerusalem, their largest demonstration in 10 years.

The parents say their stance is not based on racism or ethnicity, but is about differences in religious observance between the Ashkenazi and Sephardi traditions.