More than 1,300 buildings in the Gaza Strip have been destroyed, the United Nations said Saturday, after nearly a week of fierce bombardment by Israeli forces.

The UN’s humanitarian agency OCHA said “5,540 housing units” in those buildings were destroyed and nearly 3,750 more homes were so badly damaged they were uninhabitable.

Prime Minister Benjamin Netanyahu has said thet bombardmen is “just the beginning” as Israel seeks to retaliate against Hamas after their fighters killed more than 1,300 people a week ago, according to AFP.

At least 1,900 Gazans – most of them civilians and including more than 600 children – have been killed in missile strikes on the densely populated enclave, the Palestinian health ministry said.