Arizona is planning to execute prisoners with the same deadly gas used by the Nazis at Auschwitz, documents show

 The state of Arizona has plans to use hydrogen cyanide, the deadly gas used by the Nazis at Auschwitz and other extermination camps, to kill inmates on death row, documents obtained by The Guardian's Ed Pilkington say.

The Arizona Department of Corrections spent more than $2,000 in procuring the ingredients for the gas, The Guardian reported, citing the partially-redacted documents.

The ingredients purchased include a solid brick of potassium cyanide, sodium hydroxide pellets, and sulfuric acid, per the documents.

Cyanide is lethal in that it prevents the body from using oxygen. It was used in both World Wars — by French and Austrian troops in World War I, and by Nazi Germany in World War II, according to a 2014 fact sheet by the Johns Hopkins Center for Health Security. The trade name for hydrogen cyanide is Zyklon B.

The department has also refurbished a gas chamber in Florence, Arizona, built in 1949 but had not been used for 22 years, The Guardian reported.

The chamber was tested for "operational functionality" and "air tightness" last August, and in December, following a refurbishment, officials "verbally indicated that the vessel is operationally ready."

The documents published by The Guardian also included instructions on how to operate the gas chamber.

In a statement to Insider, the Arizona Department of Corrections, Rehabilitation and Reentry said it was "prepared to perform its legal obligation and commence the execution process as part of the legally imposed sentence, regardless of method selected."

The last person to be executed in the gas chamber in Arizona was the German national Walter LaGrand, an armed robber put to death in 1999. A witness account published in the Tucson Citizen said that it took LaGrand 18 minutes to die. The witness account said he "began coughing violently – three or four loud hacks – and then, in what appeared to be his last moments of consciousness, he made a gagging sound before falling forward at about 9:15 p.m."

Arizona law says that anyone who was sentenced to death before November 1992 can choose whether to be executed by lethal injection or lethal gas.

However, there have been no executions for seven years following the botched death penalty of the murderer Joseph Wood in 2014, according to The Guardian. Woods took two hours to die following 15 injections as he lay gasping and gulping on a gurney.

In April, The Guardian reported that the state had spent $1.5 million on execution drugs, including one thousand 1-gram vials of pentobarbital sodium salt. 

Pentobarbital is a sedative often used in vet clinics or physician-assisted suicides in Europe, The New York Times reported in 2011 and is also used in Arizona in 5-gram doses to cause a fatal overdose, according to The Guardian.

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