Kabul police chief quits amid rising militant violence

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, according to a news agency.