CAMDEN, N.J. (CBSNewYork/AP) — The family of three 11-year-old girls involved in a fatal school bus crash in southern New Jersey last week is offering thanks to all those who have supported them.

Triplet Isabelle Tezsla was killed and sisters Natalie and Sophie were severely injured. Their father is New Jersey State Trooper, Sgt. Anthony Tezsla.

READ MORE: Cuomo Faces Mounting Calls To Resign Or Face Impeachment Trial After Bombshell AG Report

Natalie was upgraded from critical to stable condition last Friday. Sophie remains in critical condition, along with classmate Jonathan Zdybel. Seventeen other students on the bus were also hurt.

Chesterfield Township police say a school bus carrying 25 Chesterfield Elementary students was on its way to the school last Thursday when a dump truck hit the driver’s side rear of the bus at an intersection. The impact then sent the bus crashing into a pole.

READ MORE: New York Auto Show Cancelled Due To COVID-19 Delta Variant Concerns

The Tezsla family said in a statement Tuesday that the outpouring of love and support has touched them profoundly. They also thanked rescue workers, doctors and nurses for their efforts.

The National Transportation Safety Board is investigating the crash between the bus and the truck, but so far, no charges have been filed against either driver.

MORE NEWS: Officials Announce Plan To Preserve Crumbling BQE For Another 20 Years

(TM and Copyright 2012 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2012 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)