As relatives and officials gather for a memorial service for the victims of the deadly attack on a Christmas market in eastern Germany, we ask what’s known about the Saudi man who has been arrested and what might have motivated him.

Also on the programme: why the US is sanctioning Pakistan's long range missiles; and the ultra-orthodox Jewish sect in Guatemala that has just been raided by the authorities for mistreating women and children.

(Photo: Memorial service after attack at Magdeburg's Christmas market, Germany Credit: FILIP SINGER/EPA-EFE/REX/Shutterstock)