A bomb blast ripped through a mosque during Friday prayers in northern Afghanistan, killing 33 people including children, just a day after the ISIS group claimed two separate deadly attacks.
Since Taliban fighters seized control of Afghanistan last year after ousting the US-backed government, the number of bombings has fallen but the jihadist and Sunni IS has continued with attacks against targets they see as heretical.
A string of bombings rocked the country this week, with deadly attacks targeting a school and a mosque in Shiite neighbourhoods.
Taliban government spokesman Zabihullah Mujahid tweeted that children were among the 33 dead in the blast on Friday at a mosque in the northern province of Kunduz.
"We condemn this crime... and express our deepest sympathies to the bereaved," he said, adding 43 more were wounded.
An intelligence official said on condition of anonymity that the explosion was caused by a bomb, but it was unclear how it was detonated.
An AFP correspondent saw large holes blown through the walls of the Mawlavi Sikandar mosque, popular with Sufis in the Imam Sahib district, north of Kunduz city.
One side of the mosque was completely destroyed by the explosion.
Jihadist groups such as ISIS bear a deep hatred for Sufis who they view as heretics and accuse them of polytheism -- the greatest sin in Islam -- for seeking the intercession of dead saints.
"The sight at the mosque was horrifying. All those who were worshipping inside the mosque were either injured or killed," Mohammad Esah, a shopkeeper who helped ferry victims to the district hospital, told news agency AFP.
"I saw 20 to 30 bodies," another local resident said.
"Shrapnel injuries"
Relatives of victims arrived at the local hospital to look for their loved ones.
"My son is martyred," screamed one man, while a woman accompanied by her four children searched for her husband.
A nurse told AFP over the phone that between 30 to 40 people had been admitted for treatment of wounds from the blast.
About a dozen ambulances ferried the seriously wounded to the main provincial hospital in Kunduz city.
"The shrapnel injuries on the bodies of the wounded show they were caused by a bomb explosion," a doctor at the provincial hospital told AFP.
Friday's blast was one of the biggest attacks since the Taliban seized power on August 15 last year.
The deadliest was just days later when more than 100 Afghan civilians and 13 US servicemen were killed in a suicide attack at Kabul airport as tens of thousands were trying to flee the country.
ISIS claimed responsibility for that attack.
The regional IS branch in Sunni-majority Afghanistan has repeatedly targeted Shiites and minorities like Sufis, who follow a mystical branch of Islam.
ISIS is a Sunni Islamist group like the Taliban, but the two are bitter rivals.
The biggest ideological difference between the two is that the Taliban sought only an Afghanistan free of foreign forces, whereas ISIS wants an Islamic caliphate stretching from Turkey to Pakistan and beyond.
ISIS claimed a bombing at a Shiite mosque in the northern city of Mazar-i-Sharif on Thursday that killed at least 12 people and wounded 58 more. The Taliban say they have arrested the "mastermind" of the attack.
They also claimed a separate attack in Kunduz city on Thursday, which killed four people and wounded 18.
Challenge facing Taliban
No group has yet to claim twin blasts on a boys' school in a Shiite neighbourhood of Kabul on Tuesday, which killed six and wounded more than 25.
Shiite Afghans, who are mostly from the Hazara community, make up between 10 and 20 percent of Afghanistan's population of 38 million.
Taliban officials insist their forces have defeated ISIS, 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," said Hekmatullah Hekmat, an independent political and security expert.
"If that is not sustained and if they fail to restrain IS, then they will also be a failure like the previous government."
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
