Funeral services were held Sunday for one of the victim's in this week's school bus crash near Cottonwood, Minnesota.

Emilee Olson was one of four children who were killed when deputies say a van apparently went through a stop sign and slammed into the bus on Tuesday.

Vehicular homicide charges have been filed against the driver, who identified herself as 23-year-old Alianiss Nunez Morales.

Investigators say she's an illegal immigrant and is going by an alias.

Immigration and customs agents are investigating her true identity.