Panama's efforts to stop maritime trafficking in its waters has forced traffickers to use land routes in Costa Rica, according to Costa Rican anti-drug authorities.
Anti-drug commissioner Mauricio Boraschi said that traffickers are increasingly moving drugs over the country's road system, reports newspaper Nacion.
Police seized 371 kilos of cocaine over Friday and Saturday, joining almost a ton seized the previous week.
Costa Rican authorities said it has not yet been determined whether the seized drugs belonged to international cartels.
Panama's air and sea forces have seized more than eight tons of cocaine so far in 2011, according to figures quoted in the Nacion report. These increased efforts have meant that the land route has "resumed its relevance," according to Boraschi.