Taliban arrest IS 'mastermind' of Afghan mosque attack: police
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IS has claimed responsibility for the bomb blast that tore through the Seh Dokan mosque during midday prayers in the northern city of Mazar-i-Sharif on Thursday.
The attack also wounded 58 people.
Balkh province's police spokesman Asif Waziri said Abdul Hamid Sangaryar was a key operative of IS.
"He played a key role in several attacks in the past and had repeatedly managed to escape, but this time we arrested him in a special operation," Waziri said.
IS also claimed a separate bomb attack in another northern city of Kunduz on Thursday that killed four people and wounded 18 people.
The Taliban authorities meanwhile stepped up security across Kabul's main mosques as worshippers performed Friday prayers in the holy month of Ramadan.
IS has taken responsibility for deadly attacks in Afghanistan, often against Shiite targets, even as the number of bombings have fallen since the Taliban seized power in August last year.
Shiite Afghans are mostly from the ethnic Hazara community and make up between 10 and 20 percent of the country's 38 million people. They have long been the target of the IS, who consider them heretics.
Earlier this week, at least six people were killed in twin blasts that hit a boys' school in a Shiite neighbourhood of Kabul.
No group has so far claimed that attack.
Key security challenge
Taliban officials insist their forces have defeated IS, but analysts say the jihadist group is a key security challenge.
"Since the Taliban took power, the only achievement that they are proud of is the improvement in security," Hekmatullah Hekmat, an independent political and security expert told AFP.
"If that is not sustained and if they fail to restrain IS then they will also be a failure like the previous government."
The biggest ideological difference between the two Sunni Islamist groups is that the Taliban sought only an Afghanistan free of foreign forces, whereas IS wants an Islamic caliphate stretching from Turkey to Pakistan and beyond.
The Taliban have regularly raided suspected IS hideouts, especially in eastern Nangarhar province -- a bastion of the Islamic State-Khorasan (IS-K), the local wing of the jihadist group.
Hundreds of alleged IS militants and supporters have been arrested in these raids.