Las Vegas police have responded to reports of a shooter on the local campus of the University of Nevada, where there appeared to be multiple victims, and then reported the suspect was "deceased".
A bank employee armed with a rifle has shot dead four colleagues and wounded nine other people at his workplace while livestreaming the attack in downtown Louisville, Kentucky.
Police in California have surrounded and searched a van believed to be connected to a mass shooting at a Chinese New Year celebration that left 10 people dead.
