From the Swedish Police preliminary investigations of the Martin Trenneborg case.
This article was originally published on VICE Sweden
Kidnappings might not be that common in Sweden, but when they do happen, they are pretty fucked up.
So much so that Stockholm syndrome, a peculiar
phenomenon in which hostages develop positive feelings toward their captors, was named after a
hostage situation that took place in
Stockholm in the 1970s.
The latest kidnapping to take place in Sweden was made public in September 2015. On the evening of the 18th, 37-year-old Martin Trenneborg entered a police station in central Stockholm alongside a woman in her early thirties. After briefly speaking
to the receptionist, the pair sat down in the waiting hall. Two hours later, the
woman was called into an interrogation room. The man stayed in his seat. Then four police officers came out and arrested him, marking the climax of a disturbing news story that the tabloids dubbed "The Sex Bunker Doctor" and "Swedish Fritzl". The chain of events includes a sound-proof bunker, poisoned strawberries and a sex contract. But more on all that latter.
On the 23rd of February this year, a Swedish court sentenced Trenneborg to 10 years in jail for kidnapping. Ever since the story broke, several criminology experts have stated that this case is one of the most disturbing in Swedish criminal history. In recognition of this alarming milestone, we assembled a brief history of Swedish
kidnappings.
A newspaper picture of Ann-Marie and a police officer in 1963, reposted by Gävledraget.
The Gevalia Daughter
The first case
of kidnapping in modern Sweden took place in 1963 – at least as far as we know. Ann-Marie
Engwall, the 7-year-old daughter of Jacob Engwall, Managing Director of Gevalia (Europe's largest coffee roasting company at the
time) was abducted on her way to school. The kidnappers, a man and and woman who remained anonymous, claimed they were going to drive her to a school trip she had just missed.
To pass the
time while waiting for the ransom money (a sum of about €1,500, which they apparently needed to fund their own
private detective agency), the perpetrators took Ann-Marie to a petting zoo and to a café. As soon as the ransom was collected,
the kidnappers put Ann-Marie in a taxi to be sent to her parents. Not wanting
to go by herself, and unable to grasp the concept of abduction, she tearfully
asked the kidnappers to join her.
Mr. and Mrs. Engwall contacted the police right after their daughter arrived. The kidnappers
turned themselves in that same day. They would do well
later in life, however.
Once they served their sentences, they got married, and had successful careers within governmental organisations.
![]()
The Ulrika Bidegårdransom photo, taken by the kidnapper. Photo: Swedish Police
The Girl in the Box
The kidnapping of Swedish Olympic equestrian Ulrika Bidegård took place in 1993. Swedish carpenter Lars Nilsson, who had
worked on renovating the Bidegård family home, attacked her outside her parents' house in Belgium. He tied her up, gagged her and sedated her with paint thinner. On the
way up the stairs to his apartment in Brussels, he dropped Bidegård on her
face, busting her lip. Once inside, she was forced to wear a blindfold and noise-cancelling headphones, and was tied sitting up inside a homemade, wooden
portable loo. During the four days she was held captive, she was given little
food and water.
Belgian police
managed to locate Nilsson after he used Bidegård's credit card to make cash
withdrawals. They raided his apartment two days later, arrested him and
liberated Bidegård from her wooden prison.
A ransom
letter arrived at the Bidegård estate the day after Nilsson's arrest, enclosed
with a photograph of Ulrika inside the box, demanding $500,000. During the
investigation, people close to Nilsson described him as kind and sound, without
criminal inclinations.
The Westerberg Case
In 2002, a guy posing as a flower deliveryman kidnapped Erik Westerberg, son of a successful business executive, from his
home in Stockholm. Westerberg had been featured at the top of a list of wealthy
youths which had been published in an
evening paper that same year. Westerberg was also put in a box, and then transported to a cottage on an
island outside of Stockholm where he was chained to a bed.
The kidnappers demanded that about €1,000,000 in cash was attached to a wire under a bridge outside of Paris, France. Westerberg's
father delivered the money personally. Soon thereafter, the kidnappers released Erik and gave him a pack of cigarettes and some matches. The Swedish Task Force found him
after he had smoked roughly three cigarettes. Once his identity had been
confirmed, Swedish police notified their colleagues in France, and shortly afterwards French police arrested the two accomplices who had received the ransom.
The box where Fabian Bengtsson was held. Photo: Swedish Police
Another Person, Another Box
The box is a
recurring theme in Swedish kidnappings. On the morning of 3rd February, 2005,
Fabian Bengtsson was found in a park in Gothenburg, having just been
released by his abductors after 17 days in captivity. "Start walking, you are free, don't look back" was the last thing the kidnappers told him before they let him go.
Bengtsson, heir to SIBA, one of the leading Nordic chains for consumer electronics, was attacked with teargas in his garage, crammed into an empty TV box and brought
to some kind of hovel. Once there, he was transferred to another soundproof wooden box with a mattress inside. The kidnappers had targeted him
in an attempt to extort about €5,000,000 from the Bengtsson family.
Over time, however, the kidnappers grew to like the abductee.
When they weren't threatening him with a homemade gun or shoving balls of tape
into his mouth, they cooked him omelettes and washed his clothes; drank whiskey
and played cards with him. After a little more than two weeks, overtaken by sympathy, they released Bengtsson. They were caught by the police thanks to the many mental notes Bengtsson took while in captivity, such as at what hours he heard the sound
of the ice-cream truck turn the corner onto their street, and how long it took the kidnappers
to get food from McDonald's.
The unheated basement where Åhman was held captive. Photo courtesy of Swedish Police
Bad
Students
Alexander Åhman, another son of another wealthy businessman,
disappeared from his student flat in Uppsala a few days after Christmas in
2011. His abductees were his housemate, a psychology student, her presumed boyfriend who was a
medicine student, and one more of their friends. After the flatmate had treated
Åhman to a pie containing sedatives (the pie was bitter apparently, but he ate it anyway to be polite) the kidnappers taped him up, put him in the back of a van and
drove 570 kilometres to an abandoned school building in the city of Umeå.
Åhman spent his week in captivity in a
dark, unheated basement, with very little food – beer being his only
source of nutrition by the end – and only a thin mattress to sleep on. It was
very cold, so Åhman tied diapers he found in the room to his feet to retain some warmth.
Four days after the kidnapping, two of the kidnappers
were in the vicinity of Stockholm. The pair had taken Åhman's mobile
phone in order to text his family, posing as him. With the app
"Find My iPhone", the family traced the phone, noting that it moved north on the
highway. The police caught the kidnappers with the help of the app, and Åhman was
rescued two days later.
The image above is the copy of a sex contract found in a folder called "Master Plan" on Trenneborg's computer. It made headlines due to its sadistic nature.
The Sex Bunker Doctor
Some time in
2010,
Dr. Martin Trenneborg allegedly began building a faux
machine shed next to his country home, in Knislinge in southern Sweden. Inside
the shed he constructed a 60 square metre, soundproof concrete bunker with
double security doors equipped with electronic locks.
Five years
later, in September 2015, Dr. Trenneborg goes on a date with a woman, in her apartment in Stockholm – 550
kilometers from Knislinge. He stays for two hours, during which they chat and
have sex, and then he suggests that they meet again in two days. She accepts. He goes
back to Knislinge that same evening to prepare.
On their
second date they drink champagne and he feeds her Rohypnol-laced strawberries.
Once she is intoxicated beyond comprehension, he hands her a diaper which she
puts on herself. He then fetches a wheelchair from
his car, rolls her out and puts her in the passenger seat. He injects her with
sedating drugs on the hour, throughout the seven-hour drive. The woman's only
memory after eating the strawberries is waking up in the car and noticing a
heartrate monitor clipped to her finger.
She wakes up
in Dr. Trenneborg's bunker. He allegedly says that she's going to stay for a few years,
cooking for him, hanging out and having unprotected sex two or three times a
day. He takes samples of her blood and vaginal swabs so he can test her for STDs, and gives
her birth control pills. He also says he's considering abducting another woman
to keep her company – possibly her mother.
Five days
after the abduction, Trenneborg leaves for Stockholm to pick up a few things
from the woman's apartment and to attend a U2 concert. When he comes home the
next day, he offers to drive her back to
Stockholm to get some of her stuff. At this point, the police have left a note on the
woman's apartment door, stating that she is missed by her family and that her
locks have been changed by the police.
During the
trip to Stockholm, worried that police are on to him he coaches her to pretend that they are a couple. He says he doesn't want to go to jail. The fact that she is being compliant and has not attempted to escape makes him hope she
will not report him. The pair arrive to the police station in central Stockholm, and it's not until she is separated from the man that she tells the police officers what has happened to her.
On the 23rd of February, Martin
Trenneborg was sentenced to ten years in prison for kidnapping. He also has to pay the woman a penalty of €19,000 in damages. Trenneborg admitted to kidnapping her but denied and was acquitted of a rape charge.
More from VICE:
We Asked Ex-Career Criminals How They Would Have Pulled Off Britain's Biggest Cash Heist
What Happens When Somebody Actually Goes Missing In the UK?
The Many Crimes of Serial Killer 'The Sick Ripper'