A Waymo robotaxi stopped in the middle of a road and blocked an ambulance near a mass shooting site in Austin; Waymo confirms it was en route for rider pickup (Nicole Cobler/Axios)

Nicole Cobler / Axios: A Waymo robotaxi stopped in the middle of a road and blocked an ambulance near a mass shooting site in Austin; Waymo confirms it was en route for rider pickup  —  A Waymo robotaxi picking up a passenger near Sunday morning's mass shooting in Austin blocked an ambulance from reaching the scene, according to a bystander video.