Majority also say coalition fight against Islamic State will not be entirely successful at stamping out threat
Al-Qaeda and other Islamic-based terrorist groups remain a concern for more than two thirds of respondents.
More than 40% of respondents express confidence in the FBI and the CIA to avert a terrorist attack.
Almost half of respondents think this kind of action is warranted when there is strong evidence of a person’s involvement in terrorist activities.
Most respondents agree with the 9/11 Commission and reject the notion that a controlled demolition took place in the World Trade Center.