An investigation into the suspicious death of a vulture at the Dallas Zoo was underway Saturday. This happened just over a week after the leopard at the same zoo went missing within hours of discovering that her enclosure had been tampered with.

Dallas police said in a statement to CBS News that officers were called to the zoo on Saturday after the vulture was found dead in its enclosure.

In a separate statement provided to CBS DFW, the zoo said staff discovered the dead vulture in the Wilds of Africa habitat under “unusual circumstances.”

While a motive has not been determined, police said they are “investigating it as suspicious.” An autopsy will be conducted. No further details were provided.

On January 13, a smoky leopard named Nova escaped from its enclosure, forcing the zoo to close and the search to continue for hours. She was finally found safe and sound near her residence later that evening.

Dallas police told CBS News over the weekend that investigators determined a “cutting tool” was used to cut a hole in the fence of Nova’s residence. Harrison Edell, the Dallas Zoo’s executive vice president of animal care and conservation, said zoologists found a gap in the mesh of her two-story enclosure, CBS DFW reports.

Dallas Police also reported thatAfter Nova’s escape, zoo staff discovered a “similar cut” in the fence of the enclosure housing the langur monkey. However, none of the monkeys got out, and all appeared unharmed.

Over the weekend, police said they were unsure if the two incidents were related.

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