Two appliances and crews from High Wycombe attended.
Three vehicles, located between two buildings, were on fire when they arrived.
The firefighters used:
- One set of breathing apparatus
- Two hose reel jets
- A short extension ladder
- A thermal imaging camera
Two of the vehicles were 100 per cent damaged by fire, and the third was 50 per cent damaged by fire.
External fixtures and windows of a two-storey block of flats were also affected.
Thames Valley Police also attended the incident, and a witness appeal has been issued.