Two lions sparked mass panic at an airport after escaping their enclosure as they were being taken onto a plane.

A lion

A lion

Vets had to fire a tranquiliser gun at the animals following a "tense" standoff with staff at Changi Airport in Singapore.

One of the beasts was seen relaxing on top of the crate after making the bid for freedom while in transit to an "overseas facility".

Singapore Airlines - who were handling the transportation of the lions - was forced to call in expert veterinary and carnivore teams to deal with the situation.

The animals are now recovering from the sedation under the care of the Mandai Wildlife Group, according to reports from The Straits Times.

In a statement, Singapore Airlines said: "The immediate priority is the lions' well-being.

"SIA is working with Mandai Wildlife Group, which operates Singapore's only wildlife facility that is equipped to look after large carnivores, on this."