One of the boys is still "hospitalized for treatment" and is being treated for serious injuries, Region Västmanland announced on Tuesday afternoon.
The other boy - aged 12-17 - has been moved to Karolinska University Hospital in Stockholm. TT has contacted the region, but it does not want to answer further questions about the injuries.
A 17-year-old girl was killed when an 18-year-old attacked her with a sword at Brinell School in Fagersta on Friday. On Sunday, the suspected perpetrator was taken into custody on probable cause for murder and attempted murder.
A third boy was slightly injured in the attack and was able to leave the hospital on Friday.
