At least two members of the Afghan security forces were killed in bomb blasts in the capital.
Basir Mujahid, a spokesman for Kabul's police chief, said nine others – six police officers and three civilians – were hurt in Saturday's attack.
Mr Mujahid said a roadside bomb hit a military vehicle as police arrived to respond to an insurgent attack. A second blast in the same location caused the casualties.
The city's police chief was among the wounded, he said.
No one immediately claimed responsibility for the attack, but both the Taliban and ISIS are active in Kabul.
The blasts followed other recent attacks, some of which were against election rallies.
Last week the UN mission in Afghanistan said it was worried about the violence during electoral campaigning.
In a report on Tuesday the UN urged all groups to stop violence against and intimidation of candidates and voters.
“I am outraged by attacks deliberately targeting civilians seeking to exercise their basic right to participate in elections,” said Tadamichi Yamamoto, the UN Secretary General’s Special Representative for Afghanistan.
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