Teenagers wearing hoodies were seen throwing objects at cars from a bridge over the A6.
The incident was reported to police at about 6.30pm yesterday (Sunday) on the A6 near John Clark Way at Rushden.
A post on the Spotted Rushden & Higham Facebook page said they saw a group of kids aged 12 to 16 wearing black hoodies throwing rocks from the bridge at cars.
The post said: “Missed our car by centimetres.
“We had to swerve out the way, with our two-year-old in the back.
“If there was another car on the other side of the road it could have been fatal.”
And the post added: “Absolutely disgusting that these children think it’s funny putting people’s lives at risk.”
A spokesman for Northants Police said they had been called to reports of a group of five youngsters aged about 15 and wearing hoodies throwing ‘something,’ possibly a conker, at cars on the A6.
The spokesman said: “It hit the roof of the car.
“We would always urge people to report it if they see this happening.”
Anyone with information about yesterday’s incident or who was a victim of it can call police on 101.