Seventy-five percent of Americans agreed with the statement “occasional acts of terrorism in the U.S. will be part of life in the future,” according to an April survey conducted after the Boston Marathon bombing. While majorities consistently hold that view over the past decade, the post-Boston number was a significant increase (from 64 percent to 74 percent) from 2012, Pew Research reports.

A high number of Americans expect future attacks to occur, but only 23 percent of survey-takers said they were “very” worried that there will soon be another terrorist attack in the U.S. Even in October 2001, just 29 percent said they were very worried about a new attack.