"At this time we're not going to be speculating on the flight path at this time, obviously that forms part of our detailed forensic investigation into the nature of the flight," Inspector Louis Provart told reporters tonight.
Norfolk police are "keeping an open mind" about the cause of the crash, he said.
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Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.
A wet, wintry night in places with rain and hill snow slow to move away from southern Scotland and northern England.
The Westminster terror attack dominates the front pages of Thursday's newspapers.