UNICEF continues to call on all parties to the conflict to adhere to and respect humanitarian principles, and ensure the safety and protection of all children.
A source within the education center confirmed that the attack has taken place inside the educational center, targeting the students.
"The casualty figures are not yet complete, so it's possible that there will be some changes in the final casualty toll", he added.
Most of the victims were young men and women - high school graduates - studying together at a private education center in the Dasht-e Barcha area.
The explosion initially set off gunfire from Afghan guards in the area, leading to assumptions that there were more attackers but all indications were that only one bomber was involved. Afghan military chiefs have enlisted the help of United States special forces...
Kabul-based journalist Sultan Faizy told RT that "the situation is really harsh and the hospitals are full of dead bodies and wounded".
The Taliban's multipronged assault, which began Friday, overwhelmed Ghazni's defenses and allowed insurgents to capture several parts of it in a major show of force.
Both the resurgent Taliban and an Islamic State affiliate in Afghanistan have targeted Shiites in the past, considering them to be heretics.
Two gunmen besieged a compound belonging to the Afghan intelligence service in a northwestern Kabul neighbourhood early Thursday, opening fire as Afghan security forces moved in to cut them off. According to reports, nine police personnel and 35 soldiers were killed in the attack.
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The violence underlined how an emboldened Taliban - which was ousted by American forces after the September 11, 2001, attacks on the USA - has been pressing its advantage throughout the country.
Many of those killed are believed to be teenagers who were getting extra tuition as they prepared for university entrance exams.
Provincial authorities announced Tuesday afternoon that insurgents had been evicted from much of Ghazni and clearing operations were underway on the city's outskirts. Afghan forces repelled the initial assault and in recent days have struggled to flush the insurgents out of residential areas where they are holed up.
Pakistani militants had filled Taliban ranks in Afghanistan when the Islamist group was ruling most of the war-shattered country until it was ousted from power by a USA -led military coalition in 2001 for sheltering al-Qaida leaders. Hundreds of people have fled the fighting in the city, which has so far killed about 100 members of the Afghan security forces and at least 20 civilians.
And in northern Baghlan province, a late Tuesday Taliban assault killed 30 soldiers and police at two checkpoints.
The U.S. and North Atlantic Treaty Organisation formally concluded their combat mission in Afghanistan at the end of 2014, but have since come to the aid of Afghan forces as they struggle to combat the resurgent Taliban.
"We can confirm the attack was caused by a suicide bomber on foot".
The Taliban stormed two small bases in northern Baghlan province on Wednesday, killing dozens of Afghan troops and police officers - the latest in a string of battlefield successes by the guerrillas, officials said.
Another witness, Abdul Wasih, 59, said his son was wounded in the leg by a mortar attack Sunday that killed five of his close relatives.