An independent investigation into the April 16 massacre at Virginia Tech criticized the university for failing to respond to the troubled behavior of senior Seung-Hui Cho before he went on his shooting rampage and for communication problems that day.

The 249-page report, released Thursday, also cited lax enforcement of gun regulations and lack of state funding for mental health as contributing factors to the tragedy.

Panel member Tom Ridge discusses the report's findings, and mental health experts David Shern and Dr. Anthony Lehman consider the revelations about Cho.

Report: The Virginia Tech Review Panel

A clinical psychologist and a behavior analyst discuss the profiles of people who commit major crimes, like the shooting spree that killed 32 in Blacksburg, Va.

View comments from students, teachers and the public about the gun law debate and the actions of those at Virginia Tech the day of the massacre.

Three education officials discuss the challenges of keeping students safe at often sprawling campuses in the wake of the Virginia Tech attacks.