A United Nations aid agency has suspended food deliveries to Palestinians in the Gaza Strip because it has run out of flour, the group said on Thursday.

The United Nations Relief and Works Agency (UNRWA) provided crucial supplies to 750,000 Palestinians in the Hamas-run Gaza Strip after Israel closed border crossings.

"Food distribution for both emergency and regular programmes will be suspended ... until further notice," the United Nations Relief and Works Agency (UNRWA) said in a statement.

The agency said wheat supplies scheduled to arrive in the Gaza Strip earlier this month did not enter the coastal territory as planned.

Israel says it shut the border with Gaza following rocket attacks by Palestinian militants.