Children aged as young as six are thought to be responsible for vandalism at a fire station, when windows were smashed.
Bricks were thrown at The Slade fire station in Oxford from a nearby recreation ground and play area in Hollow Way last week.
Windows were smashed and a training vehicle put out of action for several days.
A neighbour claims to have seen the children and shouted at them, scaring them off, shortly after 9pm on Wednesday last week.
A firefighter also ran out when he realised what had happened and saw two children aged between six and 10.
Now firefighters are urging parents to ensure their children are not involved in criminal activity.
Station manager Peter Graham said: "We have never really had any problems like this at this station and have always had a really good relationship with the local community."
Police are investigating the attack and appealed for witnesses to come forward. Call police on 08458 505505 or Crimestoppers anonymously on 0800 555111.
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