At least one person was killed and another 12 were injured in an explosion at a hospital in Gatesville, Texas on June 26. First responders were called to the medical facility, west of Waco, in the afternoon after reports of a massive blast at a construction site. Witnesses described widespread debris, plumes of black smoke and nurses rushing back into the scene to help anyone who may have been injured or trapped. Some details remain unclear, but here’s what we know so far about what happened, the extent of the injuries, the cause of the explosion and how to help.