A man who co-owned an in-home daycare in Hopkins, Minnesota, is believed to have killed his wife and 7-year-old daughter before taking his own life.

Police found the woman and child fatally stabbed in the basement and the suspect dead from a self-inflicted gunshot wound upstairs.

Six other young children were at the daycare during the incident but were unharmed and reunited with their parents.

Police also found a 78-year-old woman fatally stabbed at a nearby residence and believe the killing was connected to the daycare deaths, ABC News has reported.

Authorities say the incident appears to be an isolated domestic tragedy, with the motive and exact timeline still under investigation.