One of the triplet girls injured in a southern New Jersey school bus crash that killed her sister is out of the hospital.

Eleven-year-old Natalie Tezsla was released Wednesday afternoon. But her her sister, Sophie, and another student, 11-year-old Jonathan Zdybel, remain hospitalized in critical condition.

The school bus and a dump truck collided Feb. 16 in Chesterfield, killing Isabelle Tezsla. Authorities said 25 elementary school students were on the bus when the crash occurred, and 17 were injured.

The crash remains under investigation by local authorities and the National Transportation Safety Board, and no charges have been filed.

The triplet's father, Anthony Tezsla, is a state police sergeant.

(Copyright 2012 by The Associated Press.  All Rights Reserved.)