JAKARTA, Dec. 19 (Xinhua) -- A nine-year-old Sumatran tiger, a species on the brink of extinction, has given birth to two cubs in a wildlife park in West Sumatra province of Indonesia, park official said on Wednesday.

The male and female cubs of the Sumatran tiger were born on Sunday morning, said Ikbal, head of Kinantan Cultural and Wildlife Park.

"The mother and the cubs are in a healthy condition and they are placed in one cage, and are under monitoring of the officials," he said.

The cage was placed in an isolated area to prevent disturbance and pressure from visitors, the official said.

With the newly-born cubs, the total number of protected Sumatran tigers collected by the park rose to 11, including seven female and four males, he was quoted by state's news wire of Antara as saying.

The Sumatran tiger is the smallest of the tiger sub-species, with the length of about 2.7 meters and weighing from 75 kg up to 114 kg.

The species was listed as critically endangered in 2008 as its population was estimated at 441 to 679 individuals.