The United States has rejected an Israeli arms request that would have improved Israel's capability to attack Iran's nuclear facilities, a frontpage report in Israel's Haaretz newspaper said on Wednesday.

The U.S. warned Israel against attacking, saying such a strike would undermine American interests, the paper said. The unsourced report also says the U.S. demanded that Israel give it a heads-up if it decides to strike Iran.

Defense Minister Ehud Barak did not deny the Haaretz story and refused to discuss it in an interview with Israeli Army Radio,

"It would not be right to talk about these things," Barak said, according to Reuters.

Iran is a "threat to the whole world order, and there are many actions to be made in the realm of intelligence and preventive measures," Barak said.

The United States "does not see an action against Iran as the right thing to do at the moment," the defense minister said, but shared Israel's view that "no option should be removed from the table".

Israel believes Tehran will be capable of building a nuclear bomb by 2010, and has been pushing for greater international pressure on Iran to stop building nukes.

Both the U.S. and Israel have said they would prefer a diplomatic solution to the standoff but have not ruled out other options — including a military one.

The Associated Press contributed to this report.