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
Nasa's Maven spacecraft enters into the orbit of Mars after a 10-month, 442 million-mile journey.
British actress Emma Watson called for more feminists in society and called upon men to promote gender equality in a speech at the weekend.
Twitter falls out of favour and Instagram makes ground in the 2014 CoolBrands UK survey.