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A video has emerged showing the public killing of a woman after her alleged conviction by an informal Taliban court of killing her husband.

The video was shot in Jowzjan Province a month or two ago, officials say, and has just surfaced on social media.

A crowd listens as the verdict is given before the woman, sitting on the ground in a burqa, is shot in the back of the head. The Taliban have not commented.

Similar killings in the past were widely condemned.

The Taliban used to publicly execute women - usually over adultery - in the main stadium in the capital Kabul when they were in power in Afghanistan in the 1990s.

Last year, a young woman was stoned to death in Ghor province in central Afghanistan after being accused of adultery.

In August 2011, a woman and a man she had eloped with were stoned to death in the district of Dashte Archi in Kunduz province.

A Taliban spokesman defended the 2011 incident at the time saying: "Anyone who knows about Islam knows that stoning is in the Koran, and that it is Islamic law.

"There are people who call it inhuman - but in doing so they insult the Prophet. They want to bring foreign thinking to this country."

Mob killings are not uncommon in Afghanistan.

In March, a woman called Farkhunda Malikzada was savagely beaten and set ablaze in central Kabul after being falsely accused of burning a copy of the Koran.

The murder triggered protests across the country and led to global condemnation of the treatment of Afghan women.