No one was injured when three cars parked in Triq il-Jum in Marsa caught fire in the early hours of Wednesday morning just before 0300CEST.
According to a police statement, only one car was reported on fire at first but the blaze spread to the other two cars soon after.
The police tried to put out the fire using extinguishers before the fire brigade was called in to assist.
Magistrate Audrey Demicoli is leading an inquiry.
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