The attack in the north of the Afghan capital happened as worshippers were gathered inside Hussainia mosque, one of the biggest Shia mosques in the city, for Friday prayers.
Mir Hussain Nasiri, a member of Kabul's Shiite clerics council, told The Associated Press the attacker was disguised as a sheepherder.
Local reports say Afghan security forces arrested a second suicide bomber near the site before he could detonate his vest.
Afghan President Mohammad Ashraf Ghani condemned the attack in a statement, saying the "terrorists" targeted civilians and their holy place, which shows the attackers "are against humanity and anti-religion and faith".
The Taliban group claimed responsibility behind the attack and said the target was the U.S. secretary of defense James Mattis who arrived to Kabul city earlier that day. No group has so far claimed responsibility for the apparently sectarian attack, but Daesh or IS group had previously claimed credit for deadly attacks on the minority.
A suicide bomber blew himself up outside a Shia mosque in Kabul, Afghanistan on Friday killing six people and wounding 20 others, authorities reportedly said.
The eyewitnesses said there were others attackers as well who left the area after they could not reach the target.
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