Young boys believed to be aged between 10 and 12 stood on a bridge over the A47 and threw stones at a car, police revealed today.
Officers have described their actions as 'reckless' and 'extremely dangerous' and have appealed for information to catch the culprits.
The incident happened at about 4.30pm on Friday May 18 as a Mazda RX8, registration LA05 BAN, turned off the A47 onto Castle Acre Road at Swaffham.
Police said that as the car went under the flyover, three boys aged 10 to 12 were seen standing close to the railings - two of whom threw stones hitting the car windscreen and bumper.
One of the children is believed to have had auburn hair. No-one was injured.
PC James Simpson, of Norfolk Police who is investigating the incident, said: 'An item striking and damaging a vehicle can be an extremely dangerous and frightening situation for the driver and passengers.
'Throwing objects off bridges or overpasses onto roads is highly irresponsible and puts people at great risk.'
He added: 'This reckless behaviour will not be tolerated and anyone found committing such an offence can expect robust action from police.'
Anyone who saw what happened or noticed anyone standing close to the flyover at the time should contact PC Simpson at Norfolk Police on 101 or Crimestoppers anonymously on 0800 555 111
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