An ambulance windscreen was shattered after an 'unknown object' was thrown from the B1256 bridge along the A10.
The East of England Ambulance Service vehicle was responding to an emergency call on Wednesday, August 21.
At around 3.30pm, as the ambulance drove along the A10 in Stansted on a blue light response, the driver reported that the unknown object was thrown from the bridge at the Dunmow West turn off and struck the windscreen.
The windscreen shattered, causing £500 worth of damage.
Detective Constable Clair Ward, of Braintree CID, said: "Throwing objects from a bridge is both reckless and dangerous and we are treating this incident as criminal damage to a vehicle endangering life.
"Thankfully, the crew weren’t harmed, but the consequences could have been very serious.
"This is completely unacceptable and we would ask for the public’s help."
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Anyone with any information, CCTV, dash cam or other footage is asked to get in touch with Essex Police.
You can submit a report online at the Live Chat service, which can be found at the bottom right of the homepage at www.essex.police.uk.
Visit www.essex.police.uk/digital101 to find out more about the website reporting services.
Alternatively, you can call police on 101.
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