Police were not ruling out the possibility of arson after three cars and a motorcycle went up in flames early Thursday.
A Peugeot, Ford, Nissan and a motorcycle caught fire last night in Triq il-Vittmi tal-Gwerra, Birkirkara.
Police were informed about the incident at 5.30am.
There were no injuries.
A spokeswoman for the police said the possibility of arson was not being ruled out.
A magisterial inquiry would determine the reason behind the incident.