An Afghan government inquiry has found that many of the 72 people killed after the Baghlan suicide bombing died in gunfire from bodyguards.
The attack three weeks ago, the worst such blast in the country's history, was aimed at Afghan politicians who were visiting a sugar factory in the northern province of Baghlan.
Six parliamentarians were killed in the 6 November attack and all have been proven to have died as a result of the bombing.
However there are allegations that the majority of the rest, including 59 children, were shot by guards protecting MPs.
The school children had lined up to greet a group of opposition parliamentarians as they visited the factory.
The inquiry report quoted witnesses who said police at the scene had opened fire wildly after the attack, killing and wounding many who had survived the blast.
Taliban militants, behind a wave of suicide bombings in Afghanistan, have denied involvement in the incident.
Interior Minister Zarar Ahmad Moqbel told a news conference this afternoon that the inquiry had found 'a range of negligence and carelessness occurred in various related governmental levels.'
Mr Moqbel did not comment on which group might have been behind the attack, but ruled out any attempt by members of the government to eliminate opposition parliamentarians.
The speaker of the lower house of the Afghan parliament, Younis Qanooni, led a walk-out of about 80 MPs yesterday, accusing some government officials of not co-operating with the investigation.
Two dead in Kabul blast
A suicide car bomb aimed at US-led coalition soldiers has exploded in a suburb of Kabul killing at least two Afghans.
The insurgent Taliban movement claimed responsibility for the blast in the Wazir Akbar Khan suburb, close to the Pakistani embassy and a World Bank building and opposite an Afghan defence ministry office.
At least three other Afghan guards were also wounded.
A guard outside the World Bank premises was lightly wounded and all the windows of the building were blown out.
The force of the explosion shattered windows for several streets.
The target was a US-led coalition convoy of armoured Landcruiser vehicles, two of which were badly damaged.
