The United Nations migration agency estimates that more than 11 million people have fled their homes in Ukraine since Russia’s unprovoked war began on February 24.
More than 7.1 million had been displaced within Ukraine as of April 1, the International Organization for Migration (IOM) said on April 5 in its first full assessment in three weeks.
Another 4.24 million have fled abroad, according to the UN refugee agency, UNHCR.
"People continue to flee their homes because of war, and the humanitarian needs on the ground continue to soar," IOM chief Antonio Vitorino said.
Vitorino said humanitarian corridors are "urgently needed" to allow the safe evacuation of civilians and ensure the safe transportation of much-needed humanitarian aid to assist those internally displaced.
A survey by the IOM found that more than 60 percent of displaced households had children and 57 percent included elderly members. About 30 percent had people with chronic illnesses.
More than one-third of displaced households indicated they had had no income in the past month, the survey showed.
More than 2.9 million others are actively considering "leaving their place of habitual residence due to war,” the IOM said.