BBC - Seven people have died after a Hawker Hunter jet crashed into several vehicles during Shoreham Airshow.
The plane crashed on the nearby A27. Witnesses said it was performing a loop but could not complete the manoeuvre.
Prime Minister David Cameron sent his "heartfelt condolences" to the families of those who died in the crash.
Eyewitness Stephen Jones said: "The aeroplane involved is a Hawker Hunter T mark 7. And he'd just begun his flying display.
"He'd gone up into a loop and as he was coming out of the loop I just thought, you're too low, you're too low, pull up.
"And he flew straight into the ground either on or very close to the A27, which runs past the airport."
Ailish Southall, who was driving along the A27 in West Sussex with her two children, said the plane came down close to them.
"We were waiting for it to go back up and it didn't - it seemed to kind of split in two," she said.
"There were huge amounts of fire and we ran from the car to kind of avoid the debris because we were about 15 metres away, we were just across the road from where the accident happened."