[UPDATE BELOW] Gawker is peddling a juicy rumor that is so far unsubstantiated, but nevertheless: Radiohead is playing downtown for the Occupy Wall Street protest this afternoon, a source tells Adrien Chen. It looks like the band has been following Gothamist staffer Christopher Robbins's Twitter feed!

We do know the band is still in the area—they're sticking around to play Jimmy Fallon's show Monday night, and there's heavy speculation some Radiohead members will surface at All Tomorrow's Parties over the weekend. So it's quite conceivable that down-on-the-Man frontman Thom Yorke would swing by Occupy Wall Street. Or maybe the whole band will drive by Zuccotti Park on a vegetable oil-fueled flatbed truck, a la Foo Fighters?

Neither the band's management nor a spokesman for the protesters has responded to our inquiries, but for what it's worth, today's Occupy Wall Street agenda, sent out to the press last night, includes a "protesting police harassment" rally/march at 4 p.m.—which is when Gawker hears that Radiohead will do...something. (Another website claims the rumor has been "unofficially confirmed.") The entire Gothamist office is currently gripped by bitter infighting over who gets cut out early to cover this, but we'll update once somebody yours truly comes out on top. What would YOU do for tickets to this???

UPDATE 12:19 p.m.: A spokesperson for Occupy Wall Street confirms "Radiohead will play a surprise show today at four in the afternoon. Press conference at one in the afternoon."

Update 12:54 p.m.: The OWS spokesperson tells Gawker they have no permit but the police are "aware" of the event. This is going to be interesting—a band with Radiohead's popularity can easily draw a hundred thousand for a free show in New York City. You need permits for this sort of thing, and there, obviously, there are a lot of crowd control issues that are worked out in advance. However you slice it, this will be bananas. Press conference in 5.

Update 1:15 p.m.: Radiohead's management tells us that there's no concert for the protesters, but Occupy Wall Street insists it's happening.