"We are enhancing security measures and coordinating intelligence-sharing to proactively address potential risks," a DHS spokesperson told Newsweek.

Former FBI agent Jennifer Coffendaffer told NewsNation that lone wolf attacks are the most common type of terrorism in the U.S. “If you look over the past five years, 93% of attacks in the West have been by lone wolves,

The Federal Bureau of Investigation and the Department of Homeland Security have indicated that lone wolf attacks are the greatest threats to this year's July 4 celebrations in New York City and San Francisco.