The killing of Daunte Wright, a young black man, in a suburb of Minneapolis in the US, was because an officer mistook her gun for a Taser, according to police.

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The Brooklyn Center police manual says that officers must position Tasers "in a reaction-side holster on the side opposite the duty weapon".

Police officers are typically trained to keep guns in a holster on their dominant side to avoid confusing it with their Taser, which is kept on the belt on the other side of the body.

However, a law journal published in 2012 found nine examples of police officers accidentally using a handgun instead of a Taser between 2001 and 2009. Two of these incidents resulted in death.

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The video of the incident that was circulated by police shows the officer shouting out "Taser, Taser, Taser" before shooting, and then appearing to realise she had used a handgun instead.

Other experts point out that even if a Taser and a gun are holstered on different sides of the body, if they are both worn in a such a way that they can be easily accessed by the dominant hand, that could lead to mistakes when under pressure.

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The US-based Axon company, which developed the Taser used by the Brooklyn Center police department involved in this incident, was quoted as saying their weapons were designed to be distinguishable from handguns.

But all three were cleared of the most serious counts that could have resulted in life in prison for the death of Tyre Nichols.

Tasers fire small dart-like electrodes that can deliver a high-voltage shock to disable temporarily a suspect and allow officers to deal with violent, or potentially violent, people at a distance.

The officer has been named as Kim Potter, who had worked for Brooklyn Center Police for 26 years. She has resigned, and been charged with second-degree manslaughter.

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"So if you're right-handed you carry your firearm on your right side and [you] carry your Taser on your left," Brooklyn Center Police Chief Tim Gannon told reporters after the shooting of Mr Wright.

The Brooklyn Center police manual says officers need to be trained at least annually, and the training should include "performing reaction-hand draws or cross-draws to reduce the possibility of accidentally drawing and firing a firearm," according to Reuters news agency.

It had "implemented numerous features and training recommendations to reduce the possibility of these incidents occurring" - including making them look and feel different from a firearm.

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