The Islamic State (IS) terrorist group has claimed the responsibility for a suicide bombing in Kabul's PD9 on late Thursday, which left more than 20 people dead and 30 others injured.
The rally was held by shopkeepers to protest a crackdown on the sale of alcohol, which is illegal in Afghanistan.
I.S. say the bomber, with an explosive belt, was targetting "a gathering of Afghan intelligence and police". Among the 18 wounded were 16 officers and two civilians, deputy interior ministry spokesman Nasrat Rahimi told reporters.
The blast stripped bark from trees and shattered windows of nearby apartments, underscoring the devastating force of a single suicide bomber.
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The capital has become one of the deadliest places in war-torn Afghanistan for civilians in recent months, as the Taliban step up attacks and Isis seeks to expand its presence in the country.
The local Tolo News stated that it was a suicide attack.
The deadly assault comes a week after more than 40 people were killed and dozens more wounded in a suicide blast, claimed by Islamic State, which targeted Shia Muslims in Kabul.
Security in Kabul has been tightened since 31 May when a massive truck bomb ripped through the diplomatic quarter, killing some 150 people and wounding around 400 others, mostly civilians.