The Kremlin said on Thursday that Russia had nothing to do with the ‘Havana Syndrome,’ a mysterious illness that has affected about 200 US diplomats, officials, and family members overseas.

It was in response to a report in The Washington Post the day before that said CIA Director William Burns told the heads of Russia’s spy agencies during a recent visit to Moscow that it would be “beyond the pale” for foreign intelligence agencies to cause brain injury and other ailments to U.S. personnel and family members.

According to Kremlin spokesman Dmitry Peskov, the issue was not discussed during the CIA director’s trip or with President Vladimir Putin.

He said he could not comment on private conversations held with Russia’s security services.

“Here we can only firmly deny any hints, suggestions or statements about the supposed involvement of the Russian side in these cases,” said Peskov. “We don’t have anything to do with this.”