BaBomb:

According to the criminal complaint, on or about May 29, 2019, Allen placed an improvised explosive device at the Veterans Affairs Hospital in Bay Pines, Florida. Law enforcement personnel from the FBI, the Tampa Police Department, and other law enforcement agencies responded to the VA Hospital, and a bomb squad determined that the device contained a 9-volt battery, electrical wires, an improvised initiator, an unknown powder, and a clothespin switch. Bomb technicians ultimately rendered the device safe.

Approximately two days later, an individual called law enforcement and reported that Allen had been making other devices in his home.

https://breaking911.com/breaking-veteran-left-bomb-at-va-hospital-was-making-more-feds-say/