Police using stun grenades stormed a flat to end a stand-off with an armed man who had fired at officers in London.
Sky News Home Affairs correspondent Mark White said half a dozen explosions were heard.
"I can confirm that the gunman has been injured," he said.
Sky reporter Alistair Bunkall said he saw a man, whom he believed to be the gunman, being given resuscitation.
Paramedics had been seen moving towards a block of flats in the Markham Square area, off King's Road in Chelsea.
Police had been called after members of the public heard gunshots.
Officers came under fire and a police spokesman confirmed that they returned the fire.
The gunman fired more shots from the house just after 9pm, police said. Again, officers returned fire.
One eyewitness told Sky News: "From what I heard it seems to have been a domestic argument.
"I was in one of the stores three or four doors down from where it happened.
"I was in a changing room and a lady came in very panicked and crying and screaming a little bit.
"It seemed that her ex-partner was the one shooting - I don't know if he was shooting at her.
"It seemed that an argument started and, as she put it, it got out of hand. There was also a gentleman with her. I don't know if he was anything to do with the argument but it seems that it was of that nature."
A police officer at a cordon told local residents that shots were fired out of a jewellery shop called Folli Follie on the King's Road opposite the entrance to Markham Square, although this could not be confirmed.
The shots came from a house in Markham Square, hitting a home opposite.
The owner of the house which came under fire told Sky News the gunman is a man in his late twenties with dark hair, who was brandishing a shotgun.
He fired into one of her second floor bedrooms, sending shot spraying over pictures in the room and breaking the window.
She was outside with a friend, heard gunshots and went upstairs to see him re-loading the gun.
The woman said: "It's just very strange. I think it's going to hit me tomorrow, I don't know why someone was shooting at my house.
"I have no idea who he is, I've never seen him in my life."
A brother and sister out shopping on the King's Road told how they saw armed officers running away from Markham Square in a panic after the shots were fired, shouting: "Get the hell out, this is serious."
Georges Gillioz, 29, and his sister Poppy saw officers on either side of a doorway in the square.
Then suddenly they heard about six shots, which they described as having a "pop pop pop" sound like a pistol rather than a machine gun.
Ms Gillioz, a personal assistant, recalled seeing the first police arrive moments earlier.
She said: "I noticed them putting their weapons together, then saw them position themselves.
"Then I saw them getting their riot shields out. They were covering a door in Markham Square.
"Then there was the sound of commotion, then shots - I can't remember in what order.
"Four armed officers ran down on to the King's Road away from there. They looked panicked."

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