WASHINGTON (PAN): Even though Al Qaeda's capability has been considerably degraded over the past couple of years, there is a risk of terrorist attack on the 10th anniversary of 9/11, with a lone wolf terrorist posing greater danger, the US president has warned.

"The risk (of a terrorist attack) is always there. And, obviously, on a seminal event like the 10th anniversary of 9/11, that makes us more concerned. It means we've got heightened awareness,” Barack Obama said in an interview with the CNN.

He said the biggest concern was not the launch of a major terrorist operation, although that risk was always there. "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."

A person deranged or driven by a hateful ideology could do a lot of damage, because it was a lot harder to trace those lone wolf operators, the president believed, asking Americans to stay vigilant. There might be a little extra vigilance during 9/11, he indicated.

"On the other hand, keep in mind the extraordinary progress we've made over the last couple of years in degrading Al Qaeda's capabilities. They are a much weaker organisation with much less capability than they had just two or three years ago," Obama said.

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