The FBI arrested three Aiea teenagers Tuesday who are suspected in four armed bank and recycling center robberies,  totalling more than $40,000. The three were taken into custody at noon and are expected to appear in court Wednesday. They were accused in robberies on April 22 at the Salt Lake Reynolds Recycling center; May 1, Central Pacific Bank in Wahiawa; May 13, Salt Lake American Savings Bank; and May 30, Pearlridge branch of American Savings Bank. The FBI says a confidential informant was the key to the arrests. Marcus Kalani Watson, the 19-year-old alleged mastermind behind the four robberies, was taken into custody at Honolulu Airport while he got off a plane from Oakland, California. FBI agents were on the flight as well.  Eighteen-year-old AJ Williander was arrested at the airport. He was there to pick up Watson.  Nineteen-year-old Rogussia Danielson was arrested at his home. They were charged with one count of robbery and three counts of bank robbery. They face a maximum 20 years in prison for each count.