Three people were killed when an NBC4 news helicopter crashed and burst into flames Tuesday night in Chatsworth not far from a serious accident involving a Metro bus that also left three people dead. The area was already swarming with police, fire officials and the news media because of the bus crash when there was a fireball and people heard a loud explosion a few blocks away. Earlier in the evening, three people were killed and as many as six others injured when an SUV smashed into the side of a Metro bus in Chatsworth. The lodged vehicle trapped bus riders, who had to be extricated by first responders.