A suspected repeat robber has been arrested. Miami Police said Carlos Sainz is accused of being involved in a series of armed robberies in Miami over a 24-hour period.  The crime spree started early Monday morning when Sainz robbed a CVS on Southeast Third Avenue while holding a knife. He ended up running from the scene empty-handed. Then, police say, he stole someone’s scooter, which he used to transport himself to a nearby Walgreens to arm-rob it as well. Hours later, on Tuesday morning, he committed another robbery. He is charged with armed robbery with a deadly weapon and carjacking.