National Security Adviser Gen. H.R. McMaster met with Afghan President Ashraf Ghani and other top Afghan leaders in the country’s capital Kabul over the weekend, only days after the U.S. dropped its most powerful non-nuclear bomb on Afghanistan.

The attack was carried out with a 21,600-pound bomb called the Massive Ordnance Air Blast, or MOAB, nicknamed “The Mother of All Bombs.” Afghan officials say it killed nearly 100 ISIS militants when it was dropped on Achin district in Nangarhar province. The Guardian reports that a parliamentarian from Nangarhar says the explosion killed at least two civilians: a teacher and his young son.

Over the weekend, Afghanistan’s former president, Hamid Karzai, called President Ashraf Ghani a “traitor” for coordinating the attack with the U.S. military. He also criticized Thursday’s attack, saying, “This is not the war on terror, but the inhuman and most brutal misuse of our country as testing ground for new and dangerous weapons.”