KABUL - A suicide bomber struck a mosque in Kabul on Monday, killing 32 people, the U.N. office said, the second large-scale attack targeting minority Shiites in Kabul in just over a month.
Afghan police said the bomber, who was on foot, had walked into the mosque in western Kabul where he detonated his explosives among the crowd of worshippers.
The United Nations Assistance Mission in Afghanistan said the explosion also wounded more than 50 people, many of them children. Earlier in the day, the Afghan authorities said at least 28 people were killed and 48 wounded.
"This appalling attack on worshippers is an atrocity," the statement quoted Pernille Kardel, the Secretary-General's Deputy Special Representative for Afghanistan. "UNAMA expresses its revulsion at this latest effort by extremists to stoke sectarian violence in Afghanistan."
Monday's bombing hit during a prayers ceremony commemorating 40 days since the anniversary of the death of Imam Hussein (A.S), the slain grandson of the Prophet Muhammad (PBUH). The ceremony is known as Arbaeen, meaning 'forty' in Arabic. Imam Hussein is a revered Shiite martyr who was killed in 680 A.D. in the city of Karbala in present-day Iraq.
Faredoon Obiadi, head of the criminal investigation department for the Kabul police, said the attacker in Monday's bombing walked into the Baqir-ul Ulom mosque during prayers.
He mingled among the crowd on the first floor of the two-story building where he detonated his explosives, Obiadi said.
"Suddenly, a huge explosion happened, then everything went dark," said Ewaz Ali, 50, who was inside the mosque but suffered only minor wounds.
Kardel from UNAMA added in her statement that "religious and ethnic tolerance are values the Afghan people hold strong."
"I urge the Afghan authorities to do everything possible to defend Afghans of all faiths," she added.
U.S. Gen. John W. Nicholson, commander of the U.S.-led Resolute Support Mission in Afghanistan, condemned the bombing.

"On behalf of the men and women of Resolute Support, we offer our condolences to the families of the innocent men, women and children killed and wounded in today's attack," Nicholson said. "We will continue to stand with our Afghan partners and do everything possible to secure a peaceful, stable Afghanistan." (AP)