Footage has been released of the moment two police helicopters were completely destroyed - injuring five officers and one civilian in California when the rotor blades collided.
The incident happened in November 2012 on the heliport of the Pasadena Police Department as one helicopter was flying in and another was getting ready for takeoff.
Surveillance video of the horrific crash was only recently released showing the moments leading up the crash.
The Bell OH-58 helicopter is seen being pulled on to the pad by three men.
As the pilot prepares for takeoff, a second Bell OH-58 returns to the pad.