Public executions in USA: Five states currently allow executions by firing squad: Idaho, Mississippi, Oklahoma, South Carolina, and Utah. The Trump administration earlier this year said it would allow execution by firing squad in the federal prison system.

The public will be able to watch the execution of a former US Army major by firing squad, US Defence Secretary Pete Hegseth has said.

"It will be livestreamed. Details will follow," the Pentagon official told AFP on condition of anonymity.