At least four people have been killed and 11 others wounded when a roadside bomb hit a bus carrying Afghan government employees in Kabul on Thursday.
The bombing came on the day the Afghan government, Taliban and key countries, including the United States and Russia, gather in Moscow to push for a reduction in violence to propel the Afghan peace process forward.
No one immediately claimed responsibility for the attack, but government employees have been targeted before.
On Monday, another bombing on a minibus carrying state workers in Kabul killed three women and a three-year-old child, and wounded 13 others, security officials said.
Afghanistan is experiencing a nationwide spike in bombings, targeted killings and other violence as peace negotiations in Qatar between Taliban insurgents and the Afghan government stall.
The Islamic State group’s local affiliate has claimed responsibility for some of the violence, but many attacks go unclaimed, with the Afghan government putting the blame on the Taliban.
The insurgents have denied responsibility for most of the attacks.