Officials from the National Transportation Safety Board and the Federal Aviation Administration are investigating a plane crash in Northwestern Illinois that left four people dead.
The plane went down in a field in the Chicago suburb of Crystal Lake.
Officials say the plane was operating by "Visual-Flight rules" -- meaning the pilot was looking out the window to see where he was headed -- and was not in touch with air traffic control.
The aircraft was a Cirrus SR22 -- registered to the Marion Flying Club in Marion, Indiana.
The victims have been identified as Ray Harris, his two daughters and one of their friends.
Friends say Harris was flying his older daughter back to Wheaton College in Illinois after spending Thanksgiving in Marion.