Vice President Biden said today that evidence found at Osama bin Laden's compound in Pakistan indicated that he wanted an attack on the U.S. during this weekend's 10th anniversary of the 9/11 terrorist strikes.

Now, Biden said, investigators are studying a credible but unconfirmed report that such an attack may be imminent.

"We've been running every single thread to ground," Biden said on NBC's Today show. "This is the first credible piece of information we've gotten. We cannot confirm it. We are doing everything within our power. All hands are on deck."

Investigators have been culling through evidence gathered during the early May raid that killed bin Laden, mastermind of the attacks that took place on Sept. 11, 2001.

Biden said authorities are less worried about a "massive attack" by a major terrorist group than action by a "lone ranger, a lone actor -- not some extremely complicated plan like it took to take down the World Trade towers or the plane in Shanksville or the Pentagon."

"Doesn't mean those things couldn't happen, but they are much less likely," Biden told NBC's Ann Curry.

The vice president's advice for this weekend: "Continue your life as normal, but be vigilant."

"Report," he added. "Report anything that looks suspicious to you."

Biden also told NBC: