From Politico:

CNN had some explaining to do on the air Friday morning, following its earlier report that the Coast Guard "tried to prevent a boat from entering a security zone on the Potomac River" nearby where President Obama commemorated the attacks on Sept. 11.

It turns out the Coast Guard was involved in a training exercise.

CNN had based its initial story on reports from police scanners that shots had been fired, but had no independent confirmation.

White House press secretary Robert Gibbs told POLITICO that CNN should attend the Coast Guard's noon press conference to explain the exercise

"My only caution would be that before we report things like this, checking would be good," Gibbs said.

CBS News Radio White House correspondent Mark Knoller, on Twitter, said that "some networks have a lot of explaining to do--misinterpreting police scanner messages as shots firect [sp?] by the coast guard. He added: "As Walter Cronkite used to say, get it first, but first, get it right."

Matt Drudge singled out the network, with a blaring headline: "CNN PANIC IN DC ON 911 ANNI."

A CNN spokesperson did not immediately respond to a request for comment.

Um......yeah. Media hysteria, just the way you want to start off a 9/11 memorial, eh?:?