INVER GROVE HEIGHTS, Minn. (AP) -

Authorities say the three people killed in a fiery crash between a car and school bus accident in Inver Grove Heights were a woman and her two grandchildren.

The crash happened Friday afternoon. It remained under investigation Sunday.

Authorities haven't released the victims' names, so far, but loved ones have already built a small memorial at the scene, with flowers and three small crosses.

No children were on board the bus at the time of the crash and the bus driver was not injured.