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The New York Post said police received numerous 911 calls from anxious people who had seen signs in Manhattan for the exhibits Wednesday, a day when both Democratic presidential hopefuls were in town.

The newspaper reported authorities brought 28-year-old artist Yazmany Arboleda to the Midtown South station house where they questioned him briefly about the exhibits and released him without charging him.

"We just asked him about the exhibit in general and to question him that there was no issue of a threat", Secret Service Special Agent Kent McCarthy told the Post.

Arboleda insisted his exhibits were "about how the media has treated these two candidates over the past two years."

"It was never about violence", he told the newspaper. "It's about character assassination."

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