Medical charity Medecins Sans Frontieres says three of its staff were killed when its clinic in the Afghan city of Kunduz was hit by sustained bombing.

It said another 30 people were unaccounted for. There is no word on the nationalities of the victims.

The Taliban has clashed with government troops since its militants seized the northern city earlier this week.

Kunduz was the first major urban centre to fall to the Taliban in 14 years.

The MSF medical clinic was hit several times during "sustained bombing and was very badly damaged" at 02:10 local time (22:40 GMT) on Saturday.

It was not immediately clear who was behind bombing.

"We are deeply shocked by the attack, the killing of our staff and patients and the heavy toll it has inflicted on healthcare in Kunduz," MSF director of operations Bart Janssens said.