The attacks happened at four locations including two quick shop markets between June 18 and 25.
Police say each time the suspects came up to a person who was alone. None of the victims were seriously injured.
On Tuesday the police department put a task force together that quickly identified the suspects and began making arrests.
Three of the people arrested were over the age of 18 and the five others were all underage but will be tried as adults.
Investigators say all of the suspects have ties to local gangs.
