The Iranian Foreign Ministry on Thursday strongly condemned a suicide attack on a cultural center in Kabul, which left at least 41 people killed.
Some of those who lost their loved ones in the attack expressed outrage over the performance of government and accused them of incompetence.
The ISIS-affiliated Amaq News Agency said the terror group carried out the attack.
The blast occurred at 10:30am local time (6:00 GMT) as the suicide bomber targeted the Shiite Tebyan cultural center, which also houses the AVA news agency.
Photographs sent by witnesses showed what appeared to be serious damage at the site, in a heavily Shia Muslim area in the west of the capital, and a number of dead and wounded on the ground.
At least one suicide bomber was able to sneak into the event and sit among the participants before detonating his device, Shiite leader Abdul Hussain Ramazandada said citing witnesses.
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Two children were among the dead and 84 people were injured in the blast, according to a Health Ministry spokesman.
'It is said that target of attack was media center & education facility. "Our mutual enemies must know they will not win and the Afghan people will not be silenced", said the mission, which comprises mostly American troops. In August, 31 people were killed in a terrorist attack on a Shiite mosque in Herat, a city close to the Iran border.
The attack took place in western Kabul's Dasht-e Barchi neighborhood, a predominantly Shi'ite area that has been targeted in the past by Islamic State (IS) militants.
He called on the Afghan government and people and also the regional countries to raise awareness and maintain unity to counter terrorists.
Taliban spokesman Zabihullah Mujahid issued a statement on Twitter earlier denying involvement.
A spokesman for the USA military mission in Afghanistan, Resolute Support, said the "barbaric attack will not deter the unwavering resolve we have in supporting the Afghan National Defense and Security Forces in achieving peace and freedom for the people of Afghanistan".