An IRS special agent was killed in an accidental shooting by another agent at the federal gun range Thursday morning in Phoenix.

In a statement released, FBI officials confirmed an investigation in the death of an IRS agent is underway but did not divulge additional details as to what led up to the incident at the Federal Correctional Institutional (FCI) Phoenix firing range. The gun range was being utilized by multiple federal agencies at the time.

Phoenix Police responded to call from the Federal Bureau of Prisons gun range near 37900 North 45th Avenue about a person shot. When officers arrived on scene, they found the wounded agent. He was taken to the hospital but did not survive.

Preliminary reports state that he was shot accidentally by a fellow agent.

Phoenix police officers remained on scene until the FBI took over the investigation. The FBI have confirmed the IRS was at the range for routine training.

The FBI released the following statement:

The FBI’s Phoenix Field Office is conducting an investigation surrounding the death of an IRS special agent today, August 17, that occurred at the Federal Correctional Institution, Phoenix firing range.

While the firing range is on Bureau of Prisons grounds, an interagency agreement allows for other law enforcement agencies to use the facility for training purposes. Today, the IRS was at the range for routine training.

To preserve the integrity and capabilities of the investigation, details of the ongoing process will not be released. Findings of the FBI investigation will be turned over to the U.S. Attorney’s Office, District of Arizona for review.

The FBI’s investigation will be methodical and thorough to address every element of the incident.

The police department released the following statement:

“The Phoenix Police Department would like to send our deepest condolences to the IRS agent’s family, friends, and the agency as a whole. Our thoughts and prayers go out to each of you as you navigate through this difficult time.”

Special IRS agents assigned to undercover activities may carry and use a common firearm. IRS-CI Special Agents are trained to execute arrest and search warrants and conduct authorized undercover operations, including technical surveillance.