It is impossible for 1.1 million people to leave their homes within 24 hours.
It would involve 40,000 people per hour.
The UN said the order included everyone - all those sheltered in UN facilities including schools and health centres.
That’s why they’ve urged the Israelis to withdraw the announcement, saying that it would lead to calamity.
On the ground convoys of the International Red Cross and United Nations humanitarian agency staff have been spotted travelling south from Gaza City towards the southern part of territory, which may be in preparation of possible evacuation operation.
But it would bring chaos to try to carry out an evacuation order on this scale within 24 hours - with a civilian population in such a densely populated area including children, the elderly, and those in hospitals already packed to capacity with the wounded and those sheltering from Israel’s bombardments, BBC reports.