Aluminium railings from three balconies crashed to the ground in the middle of the night in Tower Road, Sliema, damaging two cars.
The incident occurred early on Monday morning.
Police confirmed that the damaged cars were a Volkswagen Polo and a Daihatsu Sirion, which were parked in front of the block of apartments.
Works were being carried out on the block’s facade and balconies, police said.
An insurance surveyor is examining the extent of the damage inflicted by the chunks of aluminium.