A driver's life was endangered when rocks were thrown at his van near a bridge.
Police believe two teenagers are responsible for the crime and have condemned the “mindless stupidity” of the act.
The driver, a man in his forties from Clacton, escaped injury, but his van’s headlight was smashed, causing £130 of damage.
The blue Volkwagen Transporter van was travelling along Highfields Road, Witham, at 3.15pm on Thursday.
Chief Inspector Nick Lee, Braintree district commander, said: “We have had incidents in the past on the A12 but there is nothing to suggest this is connected.
“This is mindless stupidity and it puts people’s lives in danger.”
Full story in today's Times.