The fact that there was no trace of the mother prompted environment ministry officials to send the brown cubs to a sanctuary run by Four Paws in the nearby town of Belitsa, where vets found them to be suffering from stress but in relatively good health.
The cubs, two male and one female, are about three months old and weigh between two to three kilos (4.4 to 6.6 pounds) each.
Animal carers started feeding them goat's milk and vitamins while keeping up the search for traces of their mother.
According to the environment ministry there are around 800 brown bears in Bulgaria, one of Europe's largest populations of the protected species.
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