The case is now being investigated as murder and attempted murder. The attempted murder took place in Rönnby and the murder in Skultuna.
What we know for certain now is that some kind of stabbing weapon has been used, says police press spokesperson Magnus Jansson Klarin in the evening.
The women have, or have had, a relationship with the suspected man. All are in their 40s.
The murder took place indoors, according to the police. The perpetrator was taken to hospital with unknown injuries.
The police are also investigating several cases of gross child abuse, as children were present at the scene.
Held at the hospital
The injured woman was also taken to hospital. According to Region Västmanland, she is lightly injured. The woman is staying at the hospital for observation.
The police have been able to conduct a first interview with her.
Reports of an arrest came shortly after 11 am and around the same time, TT's reporter on the spot witnessed several ambulances arriving at a residence in Skultuna.
The police earlier assessed the perpetrator as dangerous and a VMA was issued in Skultuna in the morning. The residents were urged to stay indoors.
Residents: "Scary"
Kim Jansson lives in Skultuna and heard police helicopters buzzing over the rooftops in the morning.
Kim Jansson had contact with his son, who is a teenager, via SMS and got to hear that the students were locked in. He himself also had to stay indoors due to the VMA issued.
I saw a lot of police cars, I think it was the SWAT team that arrived, and ambulances later. There were a lot of blue lights.
It's scary. Unpleasant, he says about what happened.
Two serious violent crimes
The first alarm came in as early as 7 am and large police efforts were underway during the morning in both Rönnby and Skultuna in Västerås municipality.
The impression is that the person is considered dangerous, said Tobias Ahlén Svalbro, police press spokesperson, just before lunch.
In the search for the perpetrator, among other things, a helicopter was deployed.
The distance between Rönnby and Skultuna, where the suspected crimes took place, is around a mile.
