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They are aided by sniffer dog units searching for weapons and drugs, as well as "cash dogs" which are trained to search for cash, police said.

Before the departure from Brazil, local police spent around six hours searching the yacht for drugs, with the help of a sniffer dog.

In the snippets of information shared with the media, Guardia Civil press officers referred to specialist sniffer dog teams from Madrid, helicopter crews and drones scouring the rough terrain.

Police said Friday that the coast guard, police and fire department were involved in the search, with a helicopter, drones and a police sniffer dog deployed.

Every busload of passengers is screened meticulously using a sniffer dog before it can pass.