Poll: Concern about terrorism at 13-year high

Concern among Americans that terrorist attacks are imminent is at the highest level in 13 years, according to a new poll conducted in the wake of the Orlando shooting.

More than seven in 10 adults, 71 percent, say in the CNN/ORC poll released Thursday that more acts of terrorism in the U.S. are somewhat or very likely in the next several weeks.

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That's the highest level in the poll since March 2003, when the U.S. launched its war in Iraq.

About a quarter of Americans, 24 percent, say an attack is "very likely," the highest percentage at any point since November 2001, except for a survey after Osama bin Laden's death in May 2011.

Americans largely view individual "lone wolf" attacks as a bigger threat than attacks organized by terrorist groups, including 68 percent of Republicans and 75 percent of Democrats.

Lone wolf attacks have gained increased attention in recent years as being more difficult to prevent than those hatched in collaboration with multiple suspects.

The uptick in concern about terrorism on U.S. soil comes after the massacre in Orlando earlier this month, the deadliest mass shooting in the nation's history.

Gunman Omar Mateen claimed allegiance to Islamic militants, but officials have said there wasn't evidence to indicate he was directed by an outside terrorist group to carry out the attack that left 49 dead and dozens others injured at a gay nightclub.

The poll of 1,001 adults was conducted via telephone June 16-19 with an overall margin of error of 3 points.