According to witnesses, a group of youths allegedly threw a Molotov cocktail into a parked vehicle.
The incident took place on Paulinstrasse in the city centre, not far from the Porta Nigra.
While no one was injured, substantial material damage was caused.
The investigation is ongoing.
Witnesses who can provide relevant information about the incident are asked to contact Trier police on 0049 651 9779 2290.
