Michael Ortega Casanova is one of four people who were killed after people aboard a U.S.-registered speedboat allegedly opened fire on Cuba's border patrol.

The shootout, which killed four of 10 people allegedly trying to infiltrate Cuba with terrorist intent, comes as the U.S. has choked off Cuba’s oil supply and raised the possibility of regime change.

Secretary of State Marco Rubio is commenting on Cuba's apparent confrontation with a group of armed people aboard a speedboat that allegedly reached the island from Florida. CBS News' Nancy Cordes

Cuba's Interior Ministry said Wednesday night that the boat was carrying 10 people armed with assault rifles, handguns and Molotov cocktails.

U.S. officials denied American involvement and said they did not trust conclusions drawn by Cuban authorities.

Secretary of State Marco Rubio said the U.S. is investigating an alleged shooting of four heavily armed individuals who tried to "infiltrate" Cuban territory.

The incident comes at a time of heightened tensions between Washington and Havana.

Four passengers aboard a United States-registered speedboat have been killed in the Caribbean after a confrontation with authorities from Cuba. In a statement issued on Wednesday, February 25, Cuba’s Interior Ministry said the incident occurred after a fast-moving vessel entered Cuban territorial waters without authorization.