All six other children who were at the home have been reunited with their parents, and none were injured, according to authorities in Hopkins, a suburb of Minneapolis.
Hopkins Police Chief Brent Johnson said another parent called police after witnessing the attack while bringing a child to Brown Bear Childcare.
“There’s no worse scenario than this, where you drop off your child somewhere you think is safe, and you get that phone call,” Johnson said at a news conference.
The police chief declined to release the victims’ identities or say how they died. He said he didn’t know the relationship between the two adults who owned the daycare, but the child who died is believed to be theirs.