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BREAKING: A KNBC news helicopter crashed in Los Angeles while covering a deadly Metro bus collision Tuesday evening, leaving three people dead. The helicopter went down in the Chatsworth area as news crews were covering an earlier collision involving an SUV and an LA Metro bus. Emergency crews responded to the helicopter crash, where a fire broke out after impact. Authorities said three people were pronounced dead and another person was taken to a hospital. Officials have not yet publicly identified those killed or confirmed how many of the victims were aboard the helicopter. The earlier Metro bus collision left two people dead and several others injured, bringing the confirmed death toll across the two incidents to at least five. The cause of the helicopter crash remains under investigation by federal aviation authorities. This is a developing story.