Foreign adversaries may be involved in Havana Syndrome, sources say

Read MoreFor the first time, sources tell “60 Minutes” they have evidence that a U.S. adversary may be involved in attacks on Americans linked to a mysterious condition known as Havana Syndrome. Scott Pelley reports.For the first time, sources tell “60 Minutes” they have evidence that a U.S. adversary may be involved in attacks on Americans linked to a mysterious condition known as Havana Syndrome. Scott Pelley reports.