OSCEOLA COUNTY, Fla. – Seven teenagers are in custody after a string of convenience store armed robberies in Osceola County, sheriff’s officials said.Deputies had been searching for the culprits since last week when a group of boys were caught on surveillance video storming into two separate 7-Eleven stores, according to authorities.Videos show the group robbing the store at 5880 West Irlo Bronson Memorial Highway in Kissimmee and at 8010 Osceola Polk Line Road in Davenport, according to a Osceola County Sheriff’s Office news release.Investigators say on both occasions, the teens were carrying guns when hey demanded cash and stole items from the shelves before driving off.[MORE: Armed robbers swarm cash register at Osceola County 7-Eleven]D.