The National Police Chief said at Monday's press conference that 26 police officers were injured in connection with the Easter weekend riots in various places in the country.
20 police vehicles were damaged or destroyed.
The police say that they were forced to use their own weapons in self-defense.
A total of three people were shot, according to National Police Chief Anders Thornberg.
Police Union: Not sure if we could predict this
The police union reacts with dismay to what has happened.
- It is so frustrating that so much violence has been directed at the police when we try to maintain law and order, says Tomas Stjernfeldt, first vice chairman of the Police Association.
Was it possible to predict?
- It is always difficult to make that assessment so close, but we knew that there could be disturbances and other things with this subject, but whether we could predict this serious situation, I'm not sure.
He continues:
- But of course we expect it to be part of the investigation that is done - we could have done something earlier and we could have had more information.
"Hatred and violence against police we have not seen before"
Stjernfeldt believes that in recent days the police have not had the opportunity to complete the task they are set to do.
- We have been put under severe pressure and had to retire on several occasions and a large number of colleagues have been injured.
In this way, this is a huge failure.
Then we have to look at what we can do better next time.
That will be our requirement.
Do you remember that something similar happened in modern times in Sweden?
- There are of course a lot of violent riots over the years.
But this can probably be something different.
This is aimed directly at the police, we believe.
There are attempted murders, among other things.
These are serious attempts at assault.
- It has nothing to do with the demonstrations or the issue of freedom of expression.
It is a hatred and violence against the police and we have not seen it this way before.