UNITED NATIONS, Oct. 15 -- Nearly 44,000 people in Gaza are sleeping in buildings that aid agencies say should be partly or fully demolished, and the cold and rainy season is approaching.

The count comes from the UN humanitarian office, OCHA, which said on Wednesday that it and its partners are stepping up winter preparations even as attacks on civilians continue. In the past two days, OCHA said, partners recorded airstrikes, shelling, demolition blasts, naval fire and shooting in every Gaza governorate, particularly west of the so-called Yellow Line drawn by Israeli authorities.

Fuel, plastic tarpaulins, winter clothing and medicines went in, the agency said, but the quantities are not enough. It blamed underfunding and Israeli restric...