<sod >At least four children have drowned trying to escape across the Euphrates river as Isis prepare for a last stand against the Iraqi army in Fallujah.< eod>< sod > At least four children have drowned trying to escape the Isis-heldÃÂ city of Fallujah as the Iraqi army said it was poised to enter the centre of the jihadist group's stronghold.< eod>