In this second and final part of his powerful 9/11 story, retired Port Authority Police Chief Joe Morris shares what it was like to lead the recovery effort at Ground Zero after surviving the collapse of the South Tower.

A total of 2,977 people were killed by the terrorist attacks on 9/11--72 of them were law enforcement officers working to save others. It was the deadliest day in law enforcement history.

On September 11, 2001, the Port Authority Police Department suffered the greatest single-day loss of life in U.S. law enforcement history. Thirty-seven officers never came home.

The first responsibility of any government is to keep its people safe. Yet in too many American cities that promise is going unfulfilled.

The shootout was over, but the nightmare had just begun.

hree small-town police officers found themselves face-to-face with the Boston Marathon bombers in what became the most intense firefight in modern American law enforcement history.

Motivated by racial hatred and anti-police sentiment a lone gunman killed 10 people, including five New Orleans police officers, in one of the deadliest episodes in law enforcement history.

From beat cop to FBI leadership - Louis Quijas made history as the first police officer to become FBI Assistant Director without coming up through federal ranks.

The shooting death of Virginia State Trooper Jerry Hines during a traffic death led to a shocking and grisly discovery.

In Monday’s devastating Manhattan shooting that claimed NYPD Officer Didarul Islam’s life, we witnessed two profoundly different responses that define the choice facing New York voters: courageous optimism versus political cowardice.

Police Reversal: From Defund to Refund - America Backs Blue

Dotson A. "Pop"Sutton served for 51 years as a peace officer and died after being struck by a car while on patrol at the age of 80. He is the oldest active officer ever to die in the line of duty.

In one of New Jersey's biggest narcotics cases ever, State Police Det. Albert J. Mallen Sr. was shot and killed. His death sparked a local memorial service that has been held for the last 40 years.

In the conclusion of the most harrowing survival story in law enforcement history, FBI Special Agent Ed Mireles accomplished the impossible - ending the Miami firefight with a one-handed shotgun technique that defied all odds and saved countless lives.

In 1886, an anarchist threw a bomb into a crowd of Chicago police officers, killing eight. It was the third deadliest incident in U.S. law enforcement history.

On April 11, 1986, FBI Special Agent Ed Mireles faced the most violent confrontation in Bureau history during the Miami firefight that would forever change how law enforcement officers are armed and trained.

Domestic disturbance calls are often law enforcement's worst nightmare. They are always unpredictable, often volatile and sometimes deadly.

After surviving five gunfights that should have killed him, decorated Lieutenant Randy Sutton faced his most devastating battle - against his own police department.