Compounding the horror of Friday’s massacre in New Zealand: Video emerged online that appeared to be bodycam footage of the suspect firing his weapon.

“Police are aware there is extremely distressing footage relating to the incident in Christchurch circulating online,” New Zealand Police tweeted. “We would strongly urge that the link not be shared. We are working to have any footage removed.”

The footage was distributed on a variety of platforms, including Twitter and Facebook, but work is underway to limit its distribution.

Fox News correspondent Jonathan Hunt reviewed the 16-minute video, and he described it as "truly one of the most horrific acts of violence anyone will ever see."

He said the footage -- apparently captured via helmet cam -- shows the gunman driving a vehicle to the mosque, calmly removing weapons from the trunk, walking to the entrance and opening fire.

"At least two men gunned down at the doorway. Then he walks into the mosque and shoots every single person he can see," Hunt said. "He reloads several times and at one point goes back into a room where two large groups of bodies are laying on the floor, many of them already dead, some appear to be wounded. He walks calmly around taking kill shots, finishing off his victims with head or body shots."

Hunt said the video shows the gunman leave the mosque and shoot several people on the street, including a woman wearing traditional Muslim dress.

"She is wounded, she lies on the street crying out. The gunman walks up to her and once again delivers the final shot. He then ... gets back in his car, drives over that woman, and continues to shoot other people from his car," Hunt recounted.

"The video stops after about 16 gut-wrenching minutes. It is, I can tell you, pure evil."

A 28-year-old Australian-born citizen is in custody after claiming responsibility for the attacks on the Masjid Al Noor mosque and the Linwood Masjid Mosque, which left at least 49 people dead and more than 20 seriously injured.

The man, who allegedly posted a white nationalist manifesto immediately before the murder spree, was described by Australian Prime Minister Scott Morrison as “an extremist, right-wing, violent terrorist.” Three other people are also in custody.

Watch Hunt's harrowing report above.

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