The wife of one of Norway's wealthiest businessmen who has been missing since late October is feared to have been abducted, Norwegian media outlets reported on Wednesday.
"The reason for us to go public with this case now is that, despite a broad and extensive investigation, we need more information", chief police investigator Tommy Broeske told a news conference.
Investigators refused to confirm that amount but said they advised the family not to pay the purported kidnappers.
Falkevik Hagen is married to Tom Hagen, an investor with business interests in power generation and real estate estimated to be worth 1.7 billion kroner (200 million dollars), according to financial site Kapital. It is the country's first kidnap for crypto ransom.
Chief investigator Tommy Broeske, however, chose to "go public", because they "need more information" to help track down the criminals and bring Falkevik Hagen home safely. Broeske declined to comment other than saying "the threats (in the note) were of a very serious character".
Anne-Elisabeth Falkevik Hagen, the wife of the Norwegian billionaire Tom Hagen.
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It has also been reported that there had been limited contact between police and the suspects with the only communication sent through encrypted digital platforms.
There has been no evidence since she disappeared that Mrs Hagen is safe, police say. "It is demanding and exhausting to be in such a situation over a long period of time", he said.
On Wednesday morning, as Aftenposten published its report, police put a cordon around the couple's home.
Norwegian police confirmed that "a woman in her late 60s is believed to have been kidnapped from her home in Lorenskog", around 12 miles from Oslo and 31 miles from the Swedish border, but did not disclose her identity.
Hagen's wife disappeared suddenly from the family's Lørenskog home on October 31st, and hasn't been seen since.