A zoo has been evacuated due to what police have called a “serious incident”.
Visitors were led away from Hamerton Zoo Park, near Huntingdon, Cambridgeshire, at about 11:15 BST.
A spokeswoman for the attraction denied claims on social media that a tiger had escaped from its enclosure.
A Cambridgeshire Police spokesman said: “We can confirm that no animals have escaped and members of the public are safe.”
She continued: “Officers were called at around 11.15am to reports of a serious incident at Hamerton Zoo Park, Steeple Gidding.
“Officers attended the scene along with ambulance crews and Magpas (Mid Anglia General Practitioner Accident Service – air ambulance).
“We are unable to provide further information at this time.”
A Magpas spokesman said: “At 11:34am today, the air ambulance landed in a public place near Sawtry in Cambridgeshire, after the Magpas enhanced medical team were called to a very serious incident.
“An East of England Ambulance Service paramedic crew and two rapid response vehicles were also in attendance, alongside the police.”
The zoo said it will remained closed for the day and a full statement will be issued later.
Hamerton Zoo Park includes enclosures for Malaysian tigers, Bengal tigers, cheetahs, wolves, corsac foxes, kangaroos as well as a variety of birds, reptiles and domestic animals.