Kabul’s police chief has resigned, following a surge in attacks by Afghan militants on foreigners in the city over the past two weeks.
General Zahir Zahir gave no reason for his resignation, his spokesman said.
Three South Africans and an Afghan were killed in a Taliban attack on a guesthouse used by aid workers on Saturday – the third such attack in the past 10 days.
President Ashraf Ghani is due to make a televised address later on Sunday.
President Ghani, who came to power in September, has vowed to bring peace to the country after decades of conflict.
Militants have been attacking targets in Kabul on an almost daily basis
Foreign charities in Kabul have come under concerted attack over the last 10 days
Gen Zahir was himself the target of an attack in early November, when a suicide bomber infiltrated his offices – supposed to be one of the most secure buildings in Kabul – and killed his deputy. Gen Zahir was not there at the time of the attack.
Spike in attacks
In a spate of attacks in Kabul this week, two American soldiers were killed on Monday and two British embassy workers were killed on Thursday. Dozens of Afghans have also been killed and injured.
The BBC’s Richard Galpin in Kabul says it was the deadliest in a series of suicide strikes in the capital over the past fortnight.
A senior Taliban spokesman Zabiullah Mujahid said on Twitter that the target of the attack was a Christian missionary group.
Kabul is regularly subjected to Taliban bombings, with the military, police and government officials all targeted.
This week, Taliban militants also attacked the camp formerly known as Camp Bastion in Helmand province, one month after it was vacated by British forces.