On Wednesday morning, as cleaners prepared the multi-storey venue for more events, bloodied turbans, sandals, overturned chairs and broken glass still littered the cavernous room where the massacre happened.
The first bomb attack was carried out by an assailant on a motorcycle, who blew himself up in the Shashdarak area close to the buildings of Afghanistan's National Directorate of Security in the heart of Kabul, officials said.
The attack was the largest to hit Afghanistan's most populated city in recent months.
This time, the Taliban quickly denied responsibility and condemned the attack on religious preachers and scholars, but investigators in Kabul said the group's involvement can not be ruled out.
"Gen Miller was not hurt in the rocket attack", Serat said, adding that two rockets fell on a money exchange market, about 200 metres from the governor's compound in the central strategic province.
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A witness outside Kabul's Emergency Hospital told the site "there were a lot of wounded people, I saw at least ten wounded people brought here".
In January an ambulance packed with explosives detonated in a crowded street in the heart of Kabul, killing more than 100 people, mostly civilians.
Last month's parliamentary elections sparked a wave of deadly violence across the country, with hundreds killed or wounded in poll-related attacks.
This month, Taliban militants for the first time attended an global meeting, hosted by Russian Federation, to discuss the matter.
The Taliban condemned the suicide bombing against the religious gathering, saying the insurgent group had nothing to do with the attack.
The latest attack comes as the Taliban intensifies pressure on Afghan security forces, even as the global community ramps up efforts to convince the group to engage in peace talks.