Answer:
More investigations and Manhunt for the vandals
Explanation:
More investigations and processing of the vandal scene should be carried out. Evidences such as DNA and other physical substance should be worked on. At the same time the police should make enquirers about gang hideouts and names of members of the gangs.
This would make it easier to link an individual or group of people to the vandalism and their role in the mayhem would be subsequently established. After which they are made to face to the hands of the law.
