Four people were killed and six others injured when Cuban security forces clashed with a US-registered speedboat near the island’s northern coast. The incident occurred about one mile northeast of Cayo Falcones, according to a statement issued Wednesday by Cuba’s Interior Ministry. The ministry claimed the vessel entered Cuban waters and opened fire on its security forces.

Cuban authorities said the speedboat was registered in Florida and alleged that those on board were Cuban residents of the United States attempting to infiltrate the country for terrorist activities. The ministry confirmed it had the vessel’s registration number but did not release details about the individuals involved.

Following the incident, the United States announced it would conduct its own verification of the events. US Secretary of State Marco Rubio told reporters that the operation was not a US government mission and that no government personnel were involved. He added that authorities were checking whether those aboard were US citizens or permanent residents.