After the reinforcements arrived, the Afghan army, backed by U.S. air support, began an offensive operation to regain control of the city. After several days of fighting, Afghan forces claimed to have retaken the city. However, fighting continued, and on 3 October, a US-led airstrike struck and badly damaged Kunduz Trauma Centre operated by Médecins Sans Frontières (MSF), killing doctors, staff members and patients.