Police in Essex are investigating reports that a lion has been spotted in a field near St Osyth.
Residents have been advised to stay indoors after a large cat, believed to be a lion, was seen in fields off Earls Hall Drive just before 19:00 BST.
Essex police are working with experts from Colchester Zoo who believe the reports to be genuine after being shown a photograph by a member of the public.
Armed police have been drafted into the area, along with uniformed police.
A police helicopter is searching the area where it was spotted and anyone who sees the animal is advised to call 999.