Amnesty International is claiming that the United States broke international law when it took part in an airstrike in Yemen, which killed dozens of civilians. The strike, which took place in mid-December, was directed against al-Qaida members and was heralded as a success by the Yemeni government because it killed more than 30 militants. However, Amnesty International’s arms control researcher Mike Lewis explains that the weapons used exceeded the ethical and legal limits for the civilian-populated area.