TORONTO - A second newborn polar bear cub has died, Toronto Zoo staff confirmed Thursday afternoon.

The zoo says a 10-year-old polar bear named Aurora prematurely gave birth to three cubs -- two males and a female -- on Tuesday night.

When the cubs were rejected by the mother, zoo staff intervened and moved the two surviving cubs to an intensive care unit.

The second cub succumbed to injuries inflicted by its mother on Thursday, staff said in a release.

An uninjured male cub remains under round-the-clock care.

- With files from The Canadian Press