The U.N. mission in Iraq says bombs planted by the Islamic State group are hindering the return of displaced families to the newly liberated city of Ramadi.

It's been two months since Iraqi forces, aided by U.S.-led coalition airstrikes and Sunni fighters took back Ramadi from the extremists.

U.N. development official Lise Grande says such unexploded bombs have killed eight people in the past two weeks. She says they died either while surveying their homes or attempting to disable devices inside the city.

Grande urged caution and said that "making sure" Ramadi families can go back safely is "everyone's responsibility."

Ramadi, the provincial capital of Ramadi, fell to the Islamic State group in May, a major setback for U.S.-allied Iraqi forces at time. It was liberated in December.