The wedding, at which more than 1,200 people had been invited, was in fact a mixed crowd of Shiites and Sunnis, said the event hall's owner, Hussain Ali.
The attack also comes at a greatly uncertain time in Afghanistan as the USA and the Taliban appear to be within days of a deal on ending the war after several rounds of talks this year.
An injured man talks on a mobile phone while receiving treatment in the hospital after sustaining wounds from a blast at a wedding hall in Kabul, Afghanistan, on August 18, 2019. He also confirmed that it was a suicide bombing.
The groom recalled greeting smiling guests in the afternoon, before seeing their bodies being carried out hours later.
No group had claimed responsiblity for Saturday's attack.
"There are so many dead and wounded victims", said Ahmad Omid, who survived the blast.
Mr Seddiqi posted on Twitter that he was "devastated" by the attack.
The blast, which left 182 people injured, occurred in a western Kabul neighborhood that's home to numerous country's minority Shiite Hazara community, was the deadliest attack in Kabul this year. "A heinous crime against our people; how is it possible to train a human and ask him to go and blow himself inside a wedding?!".
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Dozens possibly dead after explosion at Afghanistan wedding
A man cleans an area next to a pile of shoes and sandals of victims outside a wedding hall after a deadly bomb blast in Kabul . The Taliban claimed responsibility for the August 7 attack, even as the terror group negotiates a peace plan with Washington.
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Earlier this month, a Taliban vehicle bomb aimed at Afghan security forces detonated on the same road in a busy west Kabul neighbourhood, killing 14 people and wounding 145 - majority women, children and other civilians.
At least 40 people were killed in an explosion at a wedding hall in Kabul in November. "An act of extreme depravity", U.S. Ambassador John Bass said.
The Taliban had earlier denied responsibility for the Kabul attack and condemned it.
Saturday night's explosion came a few days after the end of the Muslim holiday of Eid al-Adha, with Kabul residents visiting family and friends, and just before Afghanistan marks its 100th independence day on Monday under heavier security in a city long familiar with checkpoints and razor wire. Afghanistan's government has been sidelined in those talks as the Taliban refuse to negotiate with what it calls a US puppet. US President Donald Trump has made no secret of his desire for a US pullout from Afghanistan and an end to America's longest war.
The deal would include a phased United States troop pullout in exchange for the Taliban guarantees that Afghanistan will not be used by extremist groups to attack United States targets.
Insurgent attacks on Afghan weddings have occurred in the past.
"Taliban can not absolve themselves of blame, for they provide platform for terrorists", President Ashraf Ghani said Sunday on Twitter, declaring a day of mourning and calling the attack "inhumane.′".
Frustration at the authorities was evident as well amid a fresh wave of grief.