A bomb attack on a Sunni mosque in the city of Kunduz in Afghanistan has killed 33 people and injured 43 others, including children, officials say.
The attack on the Mawlawi Sekandar Mosque is the second in as many days in the northern city.
It follows four attacks across Afghanistan on Thursday.
The Taliban say they have defeated IS but the group remains a key security challenge to Afghanistan’s new rulers.
No-one has admitted carrying out Friday’s attack in Kunduz, which came as worshippers gathered to pray.
The explosion was similar to Thursday’s bomb which tore through a Shia Muslim mosque in Mazar-i-Sharif, killing at least 31 people and wounding 87.
Admitting Thursday’s attacks, IS said it was part of an ongoing global campaign to “avenge” the deaths of its former leader and spokesman.
Bomb attacks in Afghanistan have declined considerably since the Taliban came to power last August following the withdrawal of US and other Western forces after 20 years in the country.
However, militants including IS have continued to target members of the Hazara Shia community who they consider heretics.
They also target the Taliban, with whom they have a fierce rivalry.
The UN Deputy Special Representative of the Secretary-General and Humanitarian Co-ordinator for Afghanistan Ramiz Alakbarov said the attacks this week were “a painful reminder of the insecurity and dangers facing the Afghan people daily”.
“The indiscriminate use of improvised explosive devices, which has already caused more than 100 civilian casualties this week, is unacceptable and must cease immediately,” Mr Alakbarov said in a statement on Friday.