Four members of the Hells Angels have been arrested in northwest Spain for allegedly smuggling 500 kilos of cocaine into the country.

Spain's Interior Ministry said the men, all Canadians, were arrested near the coastal city of Pontevedra, where one had arrived by yacht, allegedly having sailed from Colombia with the drugs.

One of the three men who met the yacht was "a known member" of the San Diego chapter of the Hells Angels and another had been under investigation for suspected drug smuggling by the Royal Canadian Mounted Police.