The events detailed have been reported by US and Yemeni government, military and intelligence officials, and by credible media, academic and other sources. Strikes include ground operations, naval attacks and airstrikes – by drone, cruise missile and conventional aircraft.
Many of the US attacks have been confirmed by senior American or Yemeni officials. However some events are only speculatively attributed to the US, or are indicative of US involvement. For example precision night-time strikes on moving vehicles, whilst often attributed to the Yemen Air Force, are more likely to be the work of US forces. We therefore class all Yemen strikes as either confirmed or possible.

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