A gunman killed at least eight people and injured multiple others before reportedly taking his own life at a FedEx facility in Indianapolis late Thursday night, according to authorities.

What are the details?

Police responded to a reports of a mass shooting at the FedEx Ground-Plainfield Operations Center near Indianapolis International Airport shortly after 11 p.m., the Indianapolis Star reported.

When police arrived, they encountered an active shooter situation, Indianapolis Police Department spokesperson Genae Cook said. She told reporters that during a search of the area, eight bodies were found. That number did not include the gunman.

"Preliminary information at this time is that the shooter took his own life," Cook said during an early morning press conference, in which she reassured the community that there was no longer an active threat. The gunman has yet to be identified by police.

Five others were injured in the attack and taken to a nearby hospital for treatment, with one listed as in critical condition, police said in an incident report Friday morning. Two others were treated by medics at the scene and released. No members of law enforcement were injured during the incident.

"This is a tragedy," Cook added, saying it was too early to determine whether the suspect was an employee who worked at the FedEx facility.

What else?

One witness told WTHR-TV he was working inside the FedEx facility when he heard gunshots.

"I'm at a bench and so I stand up and take a look at the entrance door and by the time I see the door, I see a man come out with a rifle in his hand and he starts firing and he starts yelling stuff that I could not understand," Levi Miller said. "What I ended up doing was ducking down to make sure he did not see me because I thought he would see me and he would shoot me."

"When you're in that situation, your instincts kick in," Miller added, saying he went into survival mode. "When you're in that moment in life, a lot of things start moving inside you from your mind and it all happens in a second. All for you to keep living."

Anything else?

In a statement following the incident, FedEx said, "We are deeply shocked and saddened by the loss of our team members following the tragic shooting at our FedEx Ground facility in Indianapolis. Our most heartfelt sympathies are with all those affected by this senseless act of violence. The safety of our team members is our top priority, and we are fully cooperating with investigating authorities."

Immediately after news of the shooting broke, floods of comments poured in on social media with requests for the government to do something to address the recent spate of mass shootings in America.

This is a developing story. Check back for updates.