At lunchtime, officers then started asking people to leave several other buildings located near the car park.
There are reports that police found another suspicious vehicle, which may have contained explosives.
Police told Expressen newspaper that they were working to keep people in the area safe.
Bomb Technicians have arrived at the scene and officers are also using sniffer dogs to search for further possible explosives.
According to the TT news agency, a man in his 30s was injured following the fire early this morning and taken to hospital.
Police have launched an investigation for attempted murder or manslaughter.
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