Christopher Wray said that the investigation involved all 50 states.
"And what makes it so hard is that there are not many dots to connect with some of these people," he said. "They pick soft targets, they use easy-to-use weapons; you know, IEDs [improvised explosive devices], cars, knives, guns."
READ MORE: New York City Mayor Says FBI, Police Foiled Terror Attack at School
During a Senate Appropriations Committee subcommittee hearing, the FBI director stated that "lone wolf terrorists," who are also described as persons radicalized over the internet, are the FBI's "highest counterterrorism priority at the moment."
In December 2017, the FBI released a report naming homegrown radicalized individuals as the main terrorist threat to the US in 2018, surpassing the danger of foreign-based operatives who enter the country expressly to commit acts of terror.
