He said 47 percent of those displaced have moved to camps, 29 percent are staying with families, 14 percent have settled in informal camps and 10 percent are in rented accommodation.
Abu al-Baraa al-Hamawi, a rebel leader in northern Hama, said about 95 percent of people had left a number of villages in northern and western Hama province and in southern Idlib province in the last three days due to intensive air strikes.
“We are very actively preparing for the possibility that civilians move in huge numbers in multiple directions,” Lowcock told a news briefing in Geneva.
“There needs to be ways of dealing with this problem that don’t turn the next few months in Idlib into the worst humanitarian catastrophe with the biggest loss of life of the 21st Century,” he said.
Christy Delafield of Mercy Corps, one of the largest organizations delivering aid in Syria, said it has been hard for aid workers and communities to keep up with the displacement.
“There is a lack of water storage capacity in many of the areas in which we operate, with just two or three days worth of water available to civilians,” she told Reuters.