East of England Ambulance Service spokesman said its resources have been "stood down from the scene":
Sadly, it is believed that four people in the helicopter are believed to have died in the crash. Ambulance resources have now been stood down from the scene.
Our thoughts are with the family and friends of those who have lost their lives tonight.
More top news
The Liberal Democrats have proposed to invest an extra £10 million in mental health care for military personnel
David Cameron hopes to set out a positive vision of Toryism for ethnic minorities predicting the UK's first black PM will be Conservative
Dog lover Simon Cowell will appear to resist the lure of a hypnotic dog in tonight's Britain's Got Talent show - or does he?