KABUL, Afghanistan (AP) - A suicide bomber struck a private education center Wednesday in a Shiite neighborhood of Kabul where high school graduates were preparing for university entrance exams, killing 48 young men and women and leaving behind a scene of devastation and tragedy.
The bombing, blamed on the Islamic State group, was the latest assault on Afghanistan's Shiite community, which has increasingly been targeted by Sunni extremists who consider Shiites to be heretics.
It also showed how militants are still able to stage large-scale attacks, even in the heart of Kabul, and underscored the struggles of the Afghan forces to provide security and stability on their own.
The attack comes amid a particularly bloody week in Afghanistan that has seen Taliban attacks kill scores of Afghan troops and civilians.
It was not immediately clear how the bomber managed to sneak into the building, used by the Shiite community as an education center, in the Dasht-i Barcha area of Kabul.
The spokesman for the public health ministry, Wahid Majroh, said 67 people were also wounded in the bombing and the death toll - which steadily rose in the immediate aftermath of the bombing - could rise further. He did not say if all the victims were students and whether any of their teachers were also among the casualties.
Dawlat Hossain, father of 18-year-old student Fareba who had left her class just a few minutes before the bombing but was still inside the compound, was on his way to meet his daughter and started running when he heard the explosion.
Hossain recounted to the Associated Press how when he entered Fareba's classroom, he saw parts of human bodies all over student desks and benches.
"There was blood everywhere, all over the room, so scary and horrible," he said. After finding out his daughter was safe, he helped move the wounded to hospitals.
Fareba was traumatized so many of her friends were killed, but Hossain said she was lucky to be alive.
The explosion initially set off gunfire from Afghan guards in the area, leading to assumptions there were more attackers involved, but officials later said all indications were there was only one bomber.
No group immediately claimed responsibility for the attack but Jawad Ghawari, a member of the city's Shiite clerical council, blamed IS, which has carried similar attacks on Shiites in the past, hitting mosques, schools and cultural centers. In the past two years, there were at least 13 attacks on the Shiite community in Kabul alone, he said.
Afghan President Ashraf Ghani condemned the "terrorist" attack that "martyred and wounded the innocent" - students attending class - and ordered an investigation into the attack.
"By targeting educational and cultural centers, terrorists have clearly shown they are against all those Islamic principles (that strive) for both men and women to learn and study," Ghani said in a statement.
The head of the U.N. children's agency denounced the attack, saying it's "deplorable" that children continue to be hardest hit in the growing violence across Afghanistan.
"Children are not, and must never be the target of violence," UNICEF's executive director Henrietta Fore said.
Meanwhile, a Taliban assault on two adjacent checkpoints in northern Afghanistan late on Tuesday night killed at least 30 soldiers and policemen.
The attack took place in Baghlan province's Baghlan-I Markazi district, said Mohammad Safdar Mohseni, the head of the provincial council.
Dilawar Aymaq, a parliamentarian from Baghlan, said the attack targeted a military checkpoint and another manned by the so-called local police, militias recruited and paid by the Interior Ministry.
At least nine security forces were still missing and four others were wounded in the attack, Baghlan Gov. Abdul Hai Nemati said. He said reinforcements have been dispatched to help recapture the checkpoints.
Taliban spokesman Zabihullah Mujahid claimed responsibility for the assault.
Life was gradually returning to normal Wednesday in parts of the eastern city of Ghazni after a massive, days-long Taliban attack, though sporadic gunbattles was still underway in some neighborhoods.
The Taliban launched a coordinated offensive last Friday, overwhelming the city's defenses and capturing several neighborhoods. Afghan forces repelled the initial assault and in recent days have struggled to flush the insurgents out of residential areas where they are holed up.
The United States and NATO launched airstrikes and sent military advisers to aid Afghan forces as they fight for the city, just 75 miles from the Afghan capital with a population of some 270,000 people.
At least 35 Ghazni civilians have been killed, said Arif Noori, a spokesman for the provincial governor. The wounded were still arriving at the city's only hospital, which has been overwhelmed by casualties, he added.
Hundreds of people have fled the fighting in Ghazni, which has also killed about 100 members of the Afghan security forces.