Jaf Shah, from Acid Survivors Trust International, told ITV News that acid was becoming the "weapon of choice" for many.
He said it was easily accessible and available to buy for "as little as £7 or £8".
Mr Shah told Alastair Stewart that he was "not convinced" there was a police strategy for combating the crime.
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Christopher Kerr murdered 15-year-old Michael McIlveen in 2006.
Police warned people not to approach the 32-year-old if they spotted him.
A witness said that the animals may have been spooked by the sound of a horn.