Costa Rican and U.S. authorities in a joint operation seized 2,265 kilograms (1.13 tons) of marijuana in the Caribbean Sea that apparently was brought from Jamaica in a speedboat, the Security Ministry said.

The operation was carried out last Tuesday some 180 kilometers (112 miles) off Costa Rica's Caribbean coast when the speedboat's crew - three Costa Ricans and three Nicaraguan who have not yet been identified - threw the drug overboard and then tried unsuccessfully to escape law enforcement authorities.

The U.S. Navy vessel USS Elrod arrived in Puerto Limon on Saturday with the pot, and the Costa Rican Security Ministry called the operation a "heavy blow to international drug trafficking."

The speedboat was spotted last Tuesday by the Costa Rican Air Surveillance Service and Coast Guard, which informed the U.S. frigate so that it could join the pursuit of the vessel, which lasted a couple of hours, the Security Ministry said.

The speedboat's crew were captured by the Costa Rican Coast Guard and the floating packets of pot were collected by the U.S. vessel, which turned them over to Costa Rica in accord with the joint high seas anti-drug monitoring agreement.

According to official figures, with this seizure Costa Rica has now confiscated more pot in 2012 than it did in 2011 - 1.5 tons - as well as in 2010 and 2009, 576 kilos and two tons, respectively.

The top year for marijuana seizures by Costa Rica was 2008, when authorities confiscated 4.8 tons. EFE