You really can’t make this stuff up.

(NYDN) — Radiohead didn’t rock out with the Occupy Wall Street mass yesterday, but the crowds sure did as the protest marched into its third weekend — but had a little trouble finding NYPD headquarters.

The British rock band’s rumored appearance at the downtown protest — later branded a “hoax” by organizers — swelled the ranks at the Zuccotti Park base to several thousand.

While hundreds of people have camped out overnight in the plaza during the two-week old sit-in for social change, an online announcement that Radiohead was en route jammed the plaza.

“I actually think it’s kind of ridiculous,” said a dreadlocked 20-year-old who identified himself as Pigpen. “The only reason 500 people are here is because they think Radiohead is going to be here.”

Organizers were red-faced.

“I got hoaxed,” said Patrick Bruner, who has been e-mailing on behalf of the Occupy Wall Street protesters. “Radiohead was never confirmed. Completely our fault. Apologies. ”

The band later wished protestors luck on their Twitter feed, but confirmed they would be no-shows. The band was in the city and performed two sold-out shows at the Roseland Ballroom this week.

But the infusion of new protestors lured by the Radiohead rumor brought renewed energy to the gathering, which roared as a group from the Transit Workers Union appeared at the plaza.

“I’m thrilled to be here,” said retiree Joyce Gallagher, 64, from Midwood, Brooklyn. “I think we should have been in Wall Street for three years now.”

A crowd of more than 2,000 people marched up Broadway, past a closed City Hall Park, under the arch of the Municipal Building and massed outside what some mistakenly thought was NYPD headquarters.

But most of the chanting horde plopped down in front of One St. Andrew’s Plaza, which houses the U.S. Attorney’s Office, not the NYPD.