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WEST PALM BEACH (CBSMiami) — Federal investigators are raising maintenance concerns following a tiger attack that killed a zookeeper in West Palm Beach.

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Investigators are asking questions about the tiger’s enclosure.

A new inspection report by the U.S. Department of Agriculture (USDA) found that there were tree limbs on the ground in the tiger enclosure. They said that could easily cause a keeper to trip.

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The USDA also raised concerns about discarded tarps and ropes that had been piled up behind the back fence of the enclosure.

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Stacey Konwiser was killed last month by a Malayan tiger after investigators say she failed to follow safety procedures.