The death toll from a bomb attack outside a school in the Afghan capital Kabul has risen to 68, officials said on Sunday, with doctors struggling to care for 165 injured victims and families searching desperately for missing children.

Afghan President Ashraf Ghani on Saturday blamed Taliban insurgents, but a spokesman for the group denied involvement and condemned any attacks on civilians.

United Nations Secretary-General Antonio Guterres also condemned the attack and expressed his deepest sympathies to the victims’ families and to the Afghan government and people.

“The entire night we carried bodies of young girls and boys to a graveyard and prayed for everyone wounded in the attack,” said Mohammed Reza Ali, who has been helping families of the victims at a private hospital.

“China calls on foreign troops in Afghanistan to take into full account the security of people in the country and the region, pull out in a responsible manner and avoid inflicting more turmoil and suffering on the Afghan people,” he said.

Condemning the killing of civilians, India’s Foreign Ministry said the death of more than 50 young girls made this an attack on the future of Afghanistan.