Annie Borjesson, 30, was found face down and fully clothed on Prestwick Beach

Scottish and Swedish authorities suspect suicide; her family do not agree

Documents are heavily redacted to prevent 'harm' to national interests

Documents relating to the mysterious death of a Swedish woman in Scotland have recently emerged as being 'classified as secret', sparking fresh conspiracy theories.

Annie Borjesson was discovered face down and fully clothed on Prestwick Beach, close to Glasgow Prestwick Airport on 4 December, 2005.

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She was 30 at the time.

Her bag, passport, and wallet were discovered next to her.

Annie Borjesson in a Scotland hat. She had moved there a year before she died to study English

Borjesson had moved to Edinburgh to study English in 2004.

It is understood she had travelled to Prestwick airport the day before she died with the intention to fly back to Sweden.

Scottish and Swedish authorities have both said her death was likely by drowning by suicide, though Borjesson's family do not believe this version of events.

Thought to be Borjesson at Prestwick airport the afternoon before she was found on the beach

Her death sparked a wave conspiracy theories in the years that followed.

One theory that emerged was around alleged CIA rendition flights through Prestwick airport, used for 'extralegal transfer of prisoners' between countries, according to Fox News.

No evidence has emerged to support this theory.

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Now, documents part of a year-long investigation into her death between the Swedish foreign ministry and Scottish authorities have emerged.

The files appeared as part of a six-part podcast called 'What happened to Annie', by Sky News.

Happier times: A young Borjesson with flowing red hair smiles while sitting for a photo

The files appear heavily redacted, according to the podcast, because Borjesson's death is considered 'classified as secret' by the Swedish foreign ministry.

Its reason for redacting details surrounding Borjesson's death in Scotland are 'that the information concerns Sweden's relations with a foreign state and a foreign authority'.

It goes on to say that disclosure of the information 'will damage Sweden's international relations or, in other ways harm national interests'.

Another document, filed the day after her death, appears to indicate the Swedish Embassy detailing how Scottish authorities had suspected Borjesson's suicide.

This despite no post-mortem exam conducted on Borjesson's body, according to Fox News.

Borjesson's mother, Guje Borjesson, on Prestwick Beach holding a photo of her daughter

Borjesson's mother, Guje Borjesson, told Sky News she was 'troubled' by Sweden's decision to shroud her daughter's death in secrecy.

She plans to appeal to Swedish authorities for the full release of all files relating to her daughter's death.

She is also pursuing the release of post-mortem photographs.

The Scottish Crown Office has so far refused to release the photographs, according to Fox News.

Borjesson's mother said there is a 'public interest' in finding out what happened to her daughter.

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'We are still motivated to get Annie an inquest,' she added.