Kaleigh Levine was running drills in the gym with her lacrosse team at Notre Dame College in South Euclid, Ohio, when everything turned black. “The coach wanted me to get back in the line, but I couldn’t see,” she remembered.

The FBI is growing increasingly worried about a “coordinated attack” in the U.S. similar to the recent massacre in Russia at a Moscow concert hall, the bureau’s director warned Congress on Thursday.