Local reports say after tip-offs from the public helped police identify the truck in question, two of the three people allegedly involved confessed to their involvement in the heist.
According to KSAT 12, an affiliate of U.S. network ABC, police first thought the theft of the horn shark - from the same family as Australia's Port Jackson shark - from San Antonio Aquarium was a joke.
The incident unfolded on Saturday, when an employee spotted three people near an interactive shark touch pool, the aquarium said on Facebook. The man is then seen putting the bucket inside a baby stroller and leaving the aquarium, accompanied by a man and a woman, thought to be his accomplices.
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Monroe was among several relatives who went to the train station Sunday night after hearing about the attack. Nia's wound proved to be fatal and the randomness and cruelness of the act was not lost on her family.
The thieves face felony theft charges, and police are probing to see if there are any other federal crimes related to stealing sharks. "But it turns out someone actually went inside the aquarium there in Leon Valley and stole a horn shark".
"It was something he wanted, he had one of these in the past", said Salvaggio.
Spellman said that the bleach solution the shark was placed in might have shocked the shark's system, which made aquarium staff and authorities uncertain if the shark would survive the heist. "And when we got into the garage and into the house, it looked like nearly a mock-up of (the aquarium)", he said.
The horn shark, less than a year old, didn't appear harmed when returned to the aquarium Monday night in a large plastic container.
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The aquarium said managers raced to the parking lot and caught up with the suspects - who denied access to both the vehicle and the stroller.
Police don't believe the shark was taken to sell but to be added to the suspect's collection.
On Monday police reportedly confirmed that one person was in custody and that the shark was alive.
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