They congregate on runways at the international airport in San Juan, periodically forcing officials to delay flights until they can be removed.

WSJ: To Battle Iguanas, Puerto Rico Has New Plan: Put Them on Menu

The arrests at San Juan's Luis Munoz Marin International Airport targeted two drug rings in Puerto Rico, including one that operated through the airport for more than a decade, according to two federal indictments unsealed Wednesday, hours after the raid.

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