my husband's cae was scratched deliberately.how we can do ?

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Last week,my husband found a long and deep scratch on the body of the his car.Yesterday my husband told me the car was scratched again.Oh,my god!who did do it deliberately?Every day my husband drived the car to the bus station and go to work by bus .So the car should be parked in the front of the bus station .That place is allowed to park for free.so there has no one to care. i am afraid the car would be scratched again if the car was still parked there.how can we do to avoid?any mylotter has a good suggestion?