On 14 April 2021, NATO Secretary General Jens Stoltenberg said the alliance had agreed to start withdrawing its troops from Afghanistan by 1 May. Soon after the withdrawal of NATO troops started, the Taliban launched an offensive against the Afghan government, quickly advancing in front of collapsing Afghan government forces. In June 2021, a US intelligence report predicted that the Afghan government would likely collapse within six months after NATO completed its withdrawal from the country. The report proved overly optimistic: by the second week of August, most Afghan provincial capitals had fallen into the hands of the Taliban and the Afghan National Army was in complete disarray, losing ground on all fronts. The falls of Mazar-i-Sharif and Jalalabad on 14 and 15 August respectively removed any possibility for the Afghan government to halt Taliban advance.