The Palestinian prime minister has urged international donor countries to "make good on their pledges" to help rebuild the war-battered Gaza Strip.

Rami Hamdallah told a group of donor representatives on Wednesday that only one-third of the roughly $3.5 billion pledged at a 2014 conference has been delivered. The donors are to meet next week in Brussels.

Israel battled Gaza's ruling Hamas militant group during a 50-day war in the summer of 2014 in what it said was a campaign to halt rocket fire out of the territory. More than 2,200 Palestinians, including hundreds of civilians, were killed, according to Palestinian and U.N. figures. In Israel, 66 soldiers and seven civilians were killed.

An Israeli bombing campaign also damaged or destroyed thousands of homes. Hamdallah said 75,000 Palestinians remain homeless.