<sod >At the start of the siege the UN reckoned that there were about 1.4 million civilians in Mosul and there are reported to be 100,000 still trapped in the Isis-held Old City.< eod>< sod > At the start of the siege the UN reckoned that there were about 1.5Â million civilians in Mosul and there are reported to be 100,000 still trapped in the Isis-held Old City.< eod>