TEHRAN, Young Journalists Club (YJC) -"A suicide bomber who was grazing sheep has detonated himself outside" the mosque, General Salim Almas, criminal investigative director of Kabul city, told AFP on Friday.
Medical sources said four people had been killed and 20 others injured in the terrorist attack, which came just ahead of Ashura mourning rituals.
It was not immediately clear who was responsible for the bombing; but both the Taliban and Daesh terrorist groups have targeted Shia mosques in the war-torn country in the past.
Concerns are growing over what appears to be an alarming spread of Shia killings in Afghanistan. Last month, more than 40 Shia Muslims were killed and more wounded in Kabul after Daesh terrorists attacked a mosque packed with worshipers.
That was the second attack by Daesh on a Shia mosque in less than two months. At least 32 had been killed in a similar incident in the western province of Herat in late July.
Criticism has grown over Kabul's failure to take measures to better protect its Shia Muslim population against terrorist attacks.