After leaving Gaza, Carter said he did not believe reports of a bomb plot to kill him while in Gaza.
Following Carter's entry to Gaza, five men, some wearing Hamas police uniforms, removed three large, black disks and some wire from a sand dune next to a road Carter had used.
A uniformed officer at the scene told The Associated Press that the items were explosives, but police spokesman Islam Shahwan later said that an explosives unit had found nothing.
Israeli security officials say soldiers in a lookout post spotted Hamas forces dismantling explosives. They said they passed on a warning to Carter's security detail.
The Israeli officials spoke on condition of anonymity because they were discussing classified information.
Associated Press writer Joseph Marks contributed to this report from Tel Aviv.
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