Miscreants struck at the Satish Timblo mines at Tollem in Sanguem in the early hours of Monday to set on fire 12 trucks parked there.
Nearly a hundred trucks were inside on Sunday night which were to be loaded on Monday morning.
However, when the drivers went to move their vehicles, they found that 12 trucks were set on fire. All the burnt vehicles were not in line and were randomly selected.
Sanguem police led by Police Inspector Sagar Ekoskar was at the site carrying out the panchanama and investigations.