Members of least five families linked to the US Embassy in Colombia have been stricken with suspected Havana Syndrome just days ahead of a visit by Secretary of State Antony Blinken.
The incident - which includes a child victim - is just the latest example of the mysterious neurological illness, that causes headaches, nausea, dizziness and other issues.
There have been 200 reported cases of the yet-unexplained illness at US embassies and government buildings around the globe.
Blinken is slated to meet with Colombia Vice President Marta Lucia Ramirez on October 20 in Bogota.
Concerns about the mystery illness amplified after a family was recently evacuated from Colombia for medical care, The Wall Street Journal reported.
'There was definitely a family, including a minor hit,' a source told the outlet.
'Adults sign up for what they sign up for and the risks that come with it… Targeting or even incidentally hitting kids should be a hard line.'
The latest Havana Syndrome scare mirrored an 'anomalous health incident' in Vietnam in August that delayed Vice President Kamala Harris' departure by more than three hours.
Several Americans with ties the US Embassy in Colombia were affected by Havana Syndrome
The cases were reported ahead of a scheduled visit by Secretary of State Antony Blinken
In that case, at least two U.S. personnel in Hanoi were reportedly airlifted out of the country after suffering from the Havana Syndrome.
Hours before Harris arrived in Hanoi - her next stop on an Asia trip - American personnel in Vietnam were informed that the incidents involved odd noises, a trademark characteristic of Havana Syndrome.
In Bogota, some of the effected families are staying in hotels while officials test their apartments, the Journal said.
Those working at the embassy flagged an 'unexplained health incident' last month, and in an October email said security officials were investigating 'additional anomalous health incidents,' governmental jargon for the Havana Syndrome.
Ambassador Philip Goldberg said in an email obtained by the Journal that the State Department would respond to the situation 'seriously, with objectivity, and with sensitivity.'
Vice President Kamala Harris' departure from Singapore was delayed by nearly three hours because of an 'anomalous health incident in Hanoi,' which was the next stop in her Asia trip
Generally speaking, those affected by Havana Syndrome have reported symptoms consistent with concussions, with some requiring months of medical treatment.
Some sufferers said they heard a loud noise before symptoms took hold.
What's causing Havana Syndrome remains a mystery.
Some theorize that the symptoms are caused inadvertently by surveillance
