The woman who was detained outside Magdalena Andersson's home says that she previously cleaned the Prime Minister's residence.
During the detention, the woman was wanted by the police when she was staying in the country without a permit.
People who are in a vulnerable situation can pose a security risk, according to security adviser Martin Börsvik in SVT Aktuellt.
- There is a vulnerability in this individual.
People at risk of deportation can end up in a position of dependence and be pressured to do things, he reasons.
- Cleaning staff are often on site when others are not at home, which gives great freedom to perhaps place some form of intelligence or collection device there.
"Great trust"
In modern times, Sweden has had two ministerial murders and the incident with the woman deprived of her liberty has created a discussion about the security of Swedish top politicians.
Martin Björsvik believes that the Swedish security police stand up well to the international one.
- I have great confidence in the Swedish security police, he says.
Säpo has announced that it will investigate the incident internally.