This DOES NOT HELP the Occupy Wall Street Cause.

A protester was arrested in Zuccotti Park Wednesday after he threatened to fire bomb the city — and his rant went viral on YouTube, police said.

Nkrumah Tinsley, 29, was busted after cops saw a video of him claiming he would torch the city during Thursday’s mass protest posted online, police said.

“On the 17th (of Nov.), we’re going to burn New York City to the f—ing ground,” an angry Tinsley told a crowd of demonstrators in the video posted on Tuesday.

“In a few days, you’re going to see what a Molotov cocktail can do to Macy’s.”

When officers from the NYPD’s intelligence division saw the video, they immediately began working on trying to identify the raging man, police said.

“We didn’t want him out there [Thursday]. We wanted him in our custody,” said Paul Browne, top spokesman for the NYPD. “He was specific as to date, location and method for the fire bombing …maybe it was just a rant, but we didn’t want to take that chance.”

Cops later identified Tinsley at Zuccotti Park Wednesday and collared him about 5 p.m., police said. He was charged with making terroristic threats.

Wednesday night, many Occupied Wall Street demonstrators said they would never support Tinsley’s methods.