The Los Angeles Fire Department said three people died on the scene, with one patient in 'unknown condition.' A helicopter belonging to an NBC news affiliate was covering a large traffic accident in the southern California city when it crashed. Key points and original sources are listed below.

• The Los Angeles Fire Department said three people died on the scene, with one patient in 'unknown condition.'S1

• A helicopter belonging to an NBC news affiliate was covering a large traffic accident in the southern California city when it crashed. The cause is currently unclear.S2

• The helicopter crashed as news crews were covering a collision that left at least two people deadS3

• Three people were killed Tuesday in a fiery crash when a US news media helicopter covering a deadly bus crash came down in a Los Angeles neighbourhood. Media in the city had scrambled to cover a deadly accident, after an SUV ploughed into a bus in the Chatswor...S4

• LOS ANGELES — A news helicopter crashed in a Los Angeles neighborhood on Tuesday and burst into flames, killing at least three people near the scene of where an SUV had slammed into a city bus, officials said. The helicopter crashed around 7 p.m. near a one-st...S5

• The helicopter crashed around 7 p.m. near a one-story commercial building in the neighborhood of Chatsworth in the San Fernando Valley.S6

• Descrease article font size Increase article font size A news helicopter crashed in a Los Angeles neighborhood on Tuesday and burst into flames, killing at least three people near the sceneS7

• NBC4 Los Angeles said the helicopter belonged to the station. The authorities did not immediately confirm how many people were aboard.S8