thanks for being here, everybody. "at this hour," it happened again. flags lowered to half-staff at the white house and the u.s. capitol once again. the city of san jose, california, joining the long and growing list of cities in america that are tragically marked marked bypass shootings. this is the 17th mass shooting in the last week. and there have been 232 mass shootings so far this year. the gunman tacked his own workplace, a rail yard in san jose, a terrifying scene that unfolded during our show yesterday. 24 hours ago we were starting to grasp how bad this be would. this morning authorities tell cnn this massacre could have been even worse from the weapons the shooter was carrying to the new details of bomb components that police found at the crime scene. cnn's josh campbell is live in san jose with the layest. josh