Cuba said the speedboat carrying weapons came from the United States to sow chaos. However, US Secretary of State Marco Rubio said it was not a US operation.

Prosecutors in Cuba on Tuesday charged six Cuban nationals with “crimes of terrorism” and accused them of entering Cuba with a US-flagged boat packed with weapons to stir unrest in the country.

Their boat was intercepted by Cuba’s coast guard as it entered Cuban waters last week, resulting in a shootout. Four of the Cuban nationals aboard the speedboat were killed in the incident and six others were wounded.

Last Wednesday, Cuba’s Interior ‌Ministry accused the Cuban exiles of opening fire on a border guard vessel, and said they came from the United States with the intent ​to target military units on the Communist-ruled island.

Cuban officials said the boat was carrying firearms of various calibers, including 14 rifles, 11 pistols and nearly 13,000 rounds of ammunition.