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LONDON — An English safari park says a rare Amur tiger has been killed in a fight with two other tigers.

Longleat Safari Park said Wednesday that female tiger Shouri died in a fight Tuesday after she entered an enclosure where a pair of mating tigers was being kept.

Officials say an investigation has been launched to determine how she managed to enter the enclosure through an unlocked door. Shouri had spent 12 of her 13 years at the park.

The park, located 100 miles west of London, was not open to the public at the time.

Shouri's death came four days after a Sumatran tiger was killed by a prospective mate at London Zoo.

Amur tigers are an endangered species with as few as 500 left in the wild.