An Afghan policeman opened fire Thursday on staff at a Kabul hospital run by a US charity, killing three Americans in the latest deadly attack targeting foreign civilians in the city.

Kabul has been hit by a spate of attacks targeting foreign civilians this year, including a Lebanese restaurant where 21 people died, an attack on a luxury hotel and the daylight shooting of a Swedish radio journalist.

That killing came on the eve of presidential elections to choose a successor to Hamid Karzai as US-led combat troops withdraw from Afghanistan after 13 years of fighting Taliban insurgents.

Cure International is a non-profit organisation founded in 1998, based in Pennsylvania and working in 29 countries including conservative Muslim Afghanistan.

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