bogota police seize 12 tons cocaine colombia top crime gang wednesday big haul ever nation long-running fight drug traffic president juan manuel santos say cocaine u.s. market value estimate santos 360 million find store underground four farm banana-growing region northwest antioquia province near colombia border panama thank police operation overseas intelligence friendly countries large seizure history make santos say police base cocaine lay package display santos link cocaine drug-trafficking gang know gulf clan become one big threats security since peace sign last year marxist-led revolutionary arm force colombia farc guerrillas seizure come unite state colombia staunch ally fight drug traffic raise concern increase coca cultivation government face criticism opposition lawmakers allow new crime gang fill void leave farc santos leave office next year pledge send 80,000 military police areas control farc bid prevent new traffic gang take hold four people arrest three-day operation lead drug seizure accord police statement gulf clan lead fugitive dairo antonio usuga know otoniel unite state offer reward million information lead capture death addition drug gang deal illegal mine estimate 1,500 members formerly serve rank right-wing paramilitary group colombia one world lead producers cocaine output around 910 tons per year accord u.s. drug enforcement administration anti-drug police confiscate 362 tons cocaine year colombia seize 12 tons cocaine big ever haul