A woman had to be rescued following a two-vehicle crash.
Fire crews attended the scene on the A120 in Coggeshall at 2.41pm today.
Fire fighters had released the woman using one set of cutting equipment by 3.15pm.
Harlow's appliance had been at service workshops and came across this incident as it was returning to the station.
An ambulance service spokesman said: "Three ambulances and an officer are at the scene.
"Three patients with minor injuries will be taken to Colchester General Hospital."