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."

Image copyright Reuters Image caption Farkhunda's story sparked widespread condemnation around the world

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.