JAMBI, Indonesia (AP) — A zoo official says a rare Sumatran tiger has given birth to three cubs in western Indonesia.

Arif Makhfud, an official at Taman Rimbo Zoo in Sumatran province of Jambi, says the 9-year-old mother, Uni, delivered the first cub Sunday morning, followed by the others in the afternoon.

Zoo keepers have not been able to check the sex of the cubs, Makhfud said Tuesday.

Uni was brought to Jambi three years ago along with Peter, a 7-year-old male from Jakarta. She gave birth to a pair of females two years ago.

The number of Sumatran tigers, the world's most critically endangered tiger subspecies, dwindled to about 400 from around 1,000 in the 1970s due to forest destruction and poaching. Few Sumatran tigers have been bred in captivity.