Obama warns of possible "lone wolf" attacks
US President Barack Obama warned that "lone wolf" terrorists are the biggest security threat to the United States ahead of the anniversary of the 2001 al-Qaeda attacks, DPA reported.
"The biggest concern we have right now is not the launching of a major terrorist operation," he said in an interview with broadcaster CNN late Tuesday.
"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."
"There may be a little extra vigilance during 9-11," he said, in reference to the 10th anniversary of the September 11 in New York and Washington that left around 3,500 dead.
On July 22, a Norwegian right-wing extremist allegedly set off bombs in Oslo before going on a shooting spree, killing 77 people.