“Although we will not confirm an exact number of current or past investigations, we can confirm that there are active investigations in Arizona focused on ISIS [ISIL] supporters and associated home grown violent extremists,” Collier said.
Collier explained that the FBI is actively engaged in protecting the United States from terrorist attacks in conjunction with representatives of the Joint Terrorism Task Force, which is a partnership between various US law enforcement agencies.
At present, the United States has world fourth largest number of ISIL supporters on the social media, according to the US think tank the Brookings Institution. A larger number of people support the terrorist group only in Saudi Arabia, Syria and Iraq.
The ISIL militant group controls large parts of Iraq and Syria, and is notorious for publishing numerous videos of IS committing atrocities, including beheadings of foreign hostages. The group's positions have been targeted by US-led coalition airstrikes since August 2014.