A man has died and another has been critically injured during a street fight in west London.
One man is in a critical condition in hospital
Police said three members of the public, three London ambulance staff and several police officers also suffered minor injuries.
Officers were called to reports of a violent disturbance in Harlington High Street early on Friday morning.
One man has been arrested. Police said there was no suggestion that weapons were used during the violent scuffle.
Police believe the man, who was declared dead at the scene, arrived in a car and got involved in an altercation with another man.
The second victim is said to be in a life-threatening condition at a west London hospital.
London Ambulance Services called the police for assistance at about 0430 GMT after one of their crew was assaulted at the scene.
Four ambulances and two rapid response cars were dispatched to the scene.
It is believed the three other people, one man and two women, sustained injuries when they tried to break up the fight.
A London Ambulance Service spokesman said: "Our crew requested urgent police assistance after one of the crew members was assaulted while going to the help of a passer-by."
A few hundred yards from the scene of the fight a cafe was broken into in the early hours of the morning, but it is not clear whether both the incidents are linked.
The owner of the cafe, Mark Khan said: "Got in here about ten to seven and saw the damage at the shop. I phoned the police.
"There were police here already and they told me not to go and had cordoned off the whole area."
Roads in the area have been closed for forensic examination.