Uh-Oh...

America's Mayor has got some 'splaining to do:

A couple of weeks ago, Brave New Films released a devastating six-minute clip about a Rudy Giuliani’s Achilles heel: his decision to ignore (and lie about) concerns over the FDNY’s radio equipment, which ultimately cost so many lives on 9/11.

Thanks to the film and 20,000 petition signatures collected in response, the city is going to launch an investigation.

Here's the video clip, in case you haven't seen it yet.