A nine-year-old white tiger died of his injuries at Bannerghatta Biological Park near Bengaluru in India after an attack by Royal Bengal tigers on Sunday.

Two white tigers, including the nine-year-old Shreyas, were injured on Sunday afternoon, after they sneaked through the gates separating them from the Royal Bengal tigers enclosure, reports the New Indian Express.

Santosh Kumar, Director of the Park, said Shreyas died around 8:00pm on Wednesday evening. The tiger had been showing signs of improvement and park authorities had been hopeful of his recovery, reports the NDTV.

Bengaluru: Nine-year-old White Tiger strays into the enclosure of Bengal tigers, dies after being attacked by them at Bannerghatta Bio Park pic.twitter.com/7fkLpPB7Nc

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The white tigers, a pigmented variation of the Royal Bengal tiger, were set upon by two other tigers when the gate between their enclosures was left open at the tiger safari.

C Jayaram, Additional Chief Principal Conservator of Forests, Wildlife said, ‘It is basically a mishap. While closing the gates there was some lack of coordination. They have entered into the same enclosure, there was a fight. And immediately they have separated them treated the tigers.’

Officials have launched an enquiry to find out what led to the mishap. ‘People who are lethargic should be punished.’

The second tiger that was injured was not as badly hurt as Shreyas and is doing well.

The Bengal tiger, India’s national animal, is on the list of endangered species on the International Union for Conservation of Nature Red List.