The Orange County Sheriff's Office has released helicopter video from the night of the Pulse nightclub terror attack.

The video released Monday afternoon depicts the scene from the air as that chopper flew over Pulse in Orlando while law enforcement responded in the early morning hours of June 12, 2016.

"We've got multiple casualties," is heard over radio transmission at 2:10 a.m.

The video shows law enforcement and SWAT officers at the club from between 2 a.m. to about 6 a.m.

"The last succession of shots were heard from inside," is reported over the radio at 2:11 a.m.

The bird's-eye view matches the timeline of events the Orlando Police Department released several weeks ago.

"Hey, we got a lot more cops going in the front. Is there a reason, Scott, you want (them) there?" comes over the radio at 2:15 a.m.

At 4:03 a.m., a K-9 identified the gunman's vehicle.

"That van that is underneath the awning that we have visible ammunition in the vehicle, the airport dog did hit on that van," comes over the radio.

Several minutes of a bomb scare unfolded at about 4:18 a.m.

"We are receiving text messages that there is a male in the downstairs restroom with bombs strapped onto him and loading a gun," per radio transmission.

It was during this four-hour window when law enforcement were trying to rescue one of the last groups hiding in one of the nightclub's bathrooms.

Just after 5 a.m., SWAT officers smashed part of the wall, allowing more people to flee. Also during that time frame, law enforcement officers engaged with gunman Omar Mateen, who was shot and killed.

The Orange County Sheriff's Office didn't comment on the released videos.

Mateen killed 49 people and wounded 53 others in the worst mass shooting in modern American history.

Pulse owner Barbara Poma has plans to make the location, in the SoDo area of Orlando, into a permanent memorial for the victims and their families.