A “few” U.S. personnel at the embassy in Bogotá, Colombia, have reported symptoms consistent with “Havana syndrome,” a source familiar with the cases confirmed to ABC News.

Colombia is now the latest country where American officials have reported incidents of the mysterious neurological affliction that has confounded the U.S. government for years now, but the reports are particularly notable because Secretary of State Antony Blinken is heading to Bogotá this month, the Colombian Foreign Ministry announced last week.

Symptoms include headaches, dizziness, cognitive difficulties, tinnitus, vertigo and trouble with seeing, hearing or balancing. Many officials have suffered symptoms years after reporting an incident, while some have been diagnosed with traumatic brain injuries.

It’s unclear how many U.S. officials have confirmed medical symptoms.

American diplomats, spies and other officials have reported strange experiences and debilitating symptoms in several countries now, starting with Cuba in late 2016 and expanding to China, Russia, Uzbekistan, Germany, Austria and elsewhere.

In a similar episode in August, Vice President Kamala Harris’s trip to Vietnam was delayed for a few hours after an unconfirmed case of “Havana syndrome” was reported by a staffer at the U.S. mission there.

Source-ABC