Helmand police spokesman, Fareed Obaid, said three police officers were among those killed.
Security in Kabul has been stepped up as Taliban have warned that attacks will continue.
The attack happened on a busy road in the east of the city during the morning rush hour.
Nato’s combat role in Afghanistan has ended. India will have to deal with it.
As NATO’s flag was lowered, formally ending its deployment,Taliban launched yet another bloody attack in Afg.
Taliban fighters from Pak and Afg frequently cross the borders to attack local troops and NATO forces.
Hagel said the original plan to cut US troop levels to 9,800 by the end of this year had been abandoned.
Pakistan attacked Afghan border to eliminate militants threatening Pakistan and Afghanistan.
The attacker appeared to be targeting police and local officials who were among some 1,000 people attending Monday’s funeral.
Kabul’s police spokesman declined to comment on the reason for the chief’s resignation.
The attack comes amid a spike in violence in Kabul, Afghanistan capital.
Almost 8k civilians have been killed or injured by Taliban this year, said UN humanitarian coordinator.
A total of 63 NATO troops have been killed this year, 46 of them Americans.
The president of the IOC has condemned the suicide attack on a volleyball tournament in eastern Afghanistan which killed at least 50 people.
Four Taliban militants who attacked a compound housing foreign workers in the Afghan capital were killed.