Kunduz hospital airstrike
On 3 October 2015, a United States Air Force AC-130U gunship attacked the Kunduz Trauma Centre operated by Médecins Sans Frontières (MSF, or Doctors Without Borders) in the city of Kunduz, in the eponymous province in northern Afghanistan. 42 people were killed and over 30 were injured.
Source: Wikipedia — Kunduz hospital airstrike (CC BY-SA 4.0)