A US navy destroyer fired a barrage of cruise missiles at three radar sites controlled by the rebel Houthi movement in Yemen. This attack marked the first time the US has fought the rebels directly in Yemen's devastating civil war. The Pentagon justified this attack as retaliation. Last week, missiles were fired on two separate occasions at another navy destroyer off of Yemen's southern coast. Those missiles fell harmlessly into the water, but they were enough of a provocation that the navy responded with its own bombardment. Immediately prior to those incidents, on Saturday 8 October, a 500lb laser-guided US-made bomb was dropped on a funeral procession by the US-sponsored Saudi-led coalition fighting the rebels. This bomb killed more than 140 people, mostly civilians, and wounded more than 525 people. Human Rights Watch called the incident "an apparent war crime". The US ... has sold the Saudis $110bn worth of arms since President Obama assumed office. The US also supplies the Saudis with necessary intelligence and logistics to prosecute its war. The situation in Yemen is already catastrophic and largely out of view. Since the conflict began 18 months ago, more than 6,800 people have been killed. Both rebels and the regime have committed atrocities, though most of the dead are civilians and most have been killed by Saudi-led airstrikes. Almost 14.4 million people are now "food insecure", according to the UN's World Food Program, and 2.8 million people have been displaced.