Investigations into how two people died in a light aircraft crash on the Queen's Sandringham Estate could take up to a year, it has been revealed.

Eastern Daily Press: Aerial view of Wolferton. Taken by Mike Page.Aerial view of Wolferton. Taken by Mike Page. (Image: Mike Page)

The Air Accidents Investigation Branch (AAIB) recovered the plane, a Piper PA28, on the evening of Tuesday, September 12.

It was taken to the AAIB's base in Farnborough, Hampshire, for examination.

MORE: Tributes paid to passenger Valerie Barnes, from Gateshead, killed in plane crash on Queen's Sandringham EstateAn AAIB spokesman said normally investigations take between 10 to 12 months before they can conclude how the plane crashed.

He said: 'There are all manner of things we look into – the settings the instruments were on, testing different parts, conducting interviews and obtaining records.

Eastern Daily Press: The roads were blocked in Wolferton by Police after a light aircraft crashed on the Royal Estate. Picture: Ian BurtThe roads were blocked in Wolferton by Police after a light aircraft crashed on the Royal Estate. Picture: Ian Burt (Image: Archant 2017)

'We try to come up with a picture of what happened and why.'

MORE: Pilot who died in plane crash on Queen's Sandringham Estate named as Nigel DoddsQuestions could be raised on how the plane ended up flying over the royal estate.

Since 2015 a no-fly zone was enforced within 1.5miles of Anmer Hall in the Sandringham Estate, which includes some areas of Wolferton.

The restriction bans any low-flying aircraft and drones flying below 2,000ft.

The ban was put in place amid security reasons associated with the residence of members of the royal family.