Hostages Subdue Murder Suspect Inside Gas Station in Crazy Video

TOTAL MAYHEM!!!

Hostages huddled inside an Arizona convenience store banded together to subdue a man police say fatally shot a customer moments before ... bum-rushing the suspect and tackling him to the ground in a wild incident that was caught on video!!!

Footage from the intense standoff is insane ... you see the gunman pacing around an aisle when one of the hostages suddenly engages him, wrestling him to the ground. As the struggle continues, an employee rushes over and starts smashing the alleged killer over the head with a crate.

With the gunman subdued, more hostages got in on the action ... stomping, kicking and absolutely pummeling the man as he squirms on the floor.

The unreal scene went down May 9 at a Circle K gas station in Phoenix ... and the surveillance video was just entered into evidence in the alleged killer's murder trial.

Cops shot the alleged killer, 53-year-old Joel McClain Carson, who police say walked into the store and killed a customer with a gunshot to the back of their head.

In the video ... you see the gunman barking at an employee to lock the doors, then he barricades the entrance with a donut display ... all while holding a handgun.

Once the hostages overpowered the gunman, they ran to the exit, broke down the barricade, unlocked the door and got the hell outta Dodge.

Roughly an hour later, a SWAT team makes its move ... entering the store before shooting and injuring the alleged killer.

Carson faces a first-degree murder charge for the death of Efran Hernandez, a 24-year old father of two.