Sky News understands that senior Chelsea FC officials were on board a private helicopter that disappeared off radar screens last night.
Chelsea FC say they are not aware of any officials being involved in an accident.
Police have not confirmed who was on board the craft.
The helicopter left John Lennon Airport in Liverpool last night and was heading to a private landing site near Peterborough, Cambridgeshire, when it vanished.
Rescue teams are searching an area around the north Midlands.
A police spokeswoman said: "Details are sketchy at the moment.
"The helicopter, we believe, had about four or five people on board and was a twin-engine Squirrel.
"It left John Lennon Airport in Liverpool at about 11pm last night and was on its way to a private address near Peterborough.
"It appears to have disappeared off the radar. At the moment we are trying to find out more.
"The best case scenario is that it has made an emergency landing somewhere."
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