Feds: A 'Lone Wolf' 9/11 Terrorist Attack Would be Hard to Stop

Cottage industry terror-trackers have warned for months Al Qaeda would be out for revenge for the death of Osama Bin Laden, but what scares President Obama and the FBI the most is a "lone wolf" attacker like the right-wing extremist car-bomber and gunman who killed 69 people in Norway.

Just hours after Obama revealed in an interview his fears of a lone wolf attacks, the FBI and the Department of Homeland Security began circulating a warning to local authorities to be on the lookout for individual terrorists capable of the carnage like Anders Brevik admitted to when he car-bombed government buildings and gunned-down unsuspecting patrons at a youth camp in Norway.

The problem, says one government source, is they could be anywhere among us waiting to strike with the 10th anniversary of the Sept. 11, 2001 terrorists attacks approaching and it may be impossible to know it until that person strikes.

A lone wolf could simply take it upon himself top carry out an attack without orders the Al Qaeda or any another terror organization, making it nearly impossible for federal authorities or private-industry terrorist trackers to get even a whiff of such a plot.

"The biggest concern we have right now is not the launching of a major terrorist operation, although that risk is always there," Obama said in a widely-cited interview with CNN"s Wolf Blitzer.

"The risk that we're especially concerned over right now is the lone wolf terrorist, somebody with a single weapon being able to carry out wide-scale massacres of the sort that we saw in Norway recently," Obama said. "You know, when you've got one person who is deranged or driven by a hateful ideology, they can do a lot of damage, and it's a lot harder to trace those lone wolf operators."

There will be stepped security surrounded memorial events for the 10th anniversary of the Sept. 11 attacks, remembering the fate full day that saw Al Qaeda hijack airliners and crash them into the World Trade Center in New York, the Pentagon in Washington and a field in Shanksville, Pa.