A string of armed robberies have led authorities to look at four teenagers. Atlantic City Police say they have three in custody. Kadar Williams, Robert Trotter Jr., and a 17-year-old boy were all caught by police but they are seeking a fourth. Police found the three in possession of 259 bags of heroin. The final suspect is 21-year-old Hasim Dunn, of Mays Landings. Dunn is wanted for five counts of robbery and weapons possession.