The United States is backing a year-old intelligence assessment that health problems affecting, and in some cases incapacitating, hundreds of American personnel around the world are not the result of a weapon wielded by a U.S. adversary, writes VOA.

The White House, the Pentagon and the State Department Monday stood by a March 2023 report by the National Intelligence Council that concluded it is “very unlikely” the adverse symptoms known as Havana Syndrome were caused by enemy operatives, despite a new investigation that suggests a notorious Russian intelligence unit may be to blame.

“The intelligence community has not concluded that,” said White House press secretary Karine Jean-Pierre, defending the conclusions of the 2023 assessment.

But Jean-Pierre also said the White House has not stopped looking at the issue, which in some cases has forced U.S. personnel to retire.

“We’ve taken this very seriously,” she said. “We are going to do everything that we can … We"re going to continue to do a comprehensive examination of the effects here that we"re seeing and the potential causes."

A joint investigation unveiled late Sunday by CBS’ “60 Minutes,” Germany’s Der Spiegel and The Insider, found there is reason to believe that the U.S. intelligence assessment came to the wrong conclusion.