An air ambulance has landed outside Buckingham Palace this afternoon.
The helicopter landed outside the Queen’s London residence just after 12 noon as crowds of stunned tourists looked on
According to the Met Police, a car and a bike were involved in a collision shortly before midday.
The cyclist, believed to be a male, was taken to hospital with what are thought to be life-threatening injuries.
Cops said enquiries into the incident are ongoing and Constitution Hill has been closed