Israel allegedly planted StingRay surveillance devices near White House in an attempt to monitor President Donald Trump and his associates' phones, a report citing top U.S. intelligence and national security sources said.

An investigation by the FBI and other U.S. agencies concluded that Israel was responsible for the act, according to a Politico report based on three former U.S. officials familiar with the matter.

"It was pretty clear that the Israelis were responsible," one U.S. official told the Politico on condition of anonymity.

A spokesperson from the Israeli embassy in the U.S. immediately denied the allegations and called them "absolute nonsense."

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