CNN has reported that troops from the United States participated in anti-terror raids on Trinidad and Tobago soil on Thursday, helping to capture four " high-value targets".
The raids were carried out hours before the police announced in a news conference that they had unearthed a threat to disrupt Carnival 2018, following which the US, British and Canadian Embassies issued alerts.
CNN says officials confirmed to the news agency that US military personnel from US Southern Command, which oversees US military operations in the region, advised and assisted local Trinidadian security forces in apprehending the four extremists who are believed to be part of a network engaged in plotting terror attacks.
In a news conference Thursday, a Trinidad and Tobago police official, Michael Jackman, said police uncovered a threat to disrupt the Carnival activities and detained "several persons of interest."
The nation's police and defense forces are working together to ensure a safe and secure environment for the Carnival, Jackman said in video provided by CNN affiliate CNC3 Television.
"The public, as usual, should remain vigilant," he added while not elaborating on whether the threat was terror-related.
The US Embassy in Trinidad and Tobago issued a security alert Thursday evening saying that a terror plot has been thwarted but also said that "US government personnel are advised to exercise additional caution and increased situational awareness if they participate in Carnival events," out of an "abundance of caution."
The United Kingdom's Foreign Office also issued an advisory and cautioned "an attack is still possible."
An October report by the Soufan Group, a security consultancy that tracks foreign fighters, said that approximately 130 Trinidadians have traveled to Iraq or Syria to become foreign fighters.