The UN said Monday that it would resume aid shipments into Gaza after Hamas returned supplies seized several days ago. Last week, Hamas police broke into a UN warehouse in Gaza and stole thousands of UN blankets, food parcels, and tons of rice and flour, prompting the UN to stop its aid trucks into Gaza. John Ging, Gaza head of the United Nations Relief and Works Agency (UNRWA), said Monday that Hamas officials returned the aid, prompting the UN to lift its freeze. On Sunday, meanwhile, UNRWA spokesman Chris Gunness told The Jerusalem Post that a lack of plastic bags was threatening to halt food distribution within Gaza. "After Sunday we will have no choice but to halt food distribution because we have no plastic bags," Gunness said. "Now we have a double whammy." Tovah Lazaroff contributed to this report.