Four males have been charged with causing more than $20,000 damage through graffiti in Hobart's central district.
Police said the males - aged between 15 and 20 - were identified through DNA and fingerprint analysis, or being caught in the act.
It is alleged that they are responsible for more than 100 graffiti tags on buildings and vehicles.
Investigations are continuing, and police said more tags were being identified on a daily basis.
The three juveniles will be proceeded against by restorative justice - including repatriating the damage they have caused - while the 20-year-old will be summonsed to court and charged with marking graffiti and being in possession of graffiti equipment in a public place.
These offences carry a maximum penalty of fines up to $2600 per offence.