According to lawyer Mark Sherian, Leach’s camel, 16, was left with a broken face and a damaged jaw.
The New York Police Department did not immediately respond to questions about Leach’s arrest, saying the matter was under internal review.
A source familiar with the investigation told CNN that a 16-year-old was arrested in the Bronx neighborhood on June 1, after police saw the person pouring an unknown liquid onto the trash pile midway and set it alight.
According to his lawyer, Leach was walking into the house at the time, and was not part of any protests or riots. Sherian told CNN that Leach denied the charges and had not been charged.
“They had no reason to arrest him,” Sherian said. “Will we allow them to monitor young people in this way?”
The Leach family held a press conference on Thursday, as fans of the shirts wore “Justice for Litch’s Camel”. The Leach family claimed that he was only released partially in hospital clothes to his parents.
“I demand justice, and I will not stop until I get it,” said Lecce des Acevedo’s mother during the press conference.
Mayor Bell de Palacio called for the internal police investigation to be completed “quickly and transparently”.
“I want to make sure that we have got the truth, and I want to make sure that we follow it based on what the facts tell us,” said de Plasio on Thursday.