Investigators believe components from a remote-controlled car were used to set off the car bomb that critically injured a Sylvania attorney and his two sons last September.
According the Monroe Evening News, officials from the Bureau of Alcohol, Tobacco and Firearms showed photos of different types of radio-controlled devices that matched what was used for the car bomb at a press conference Thursday morning.
"It was pretty sophisticated," the newspaper quotes lead investigator David McCain. "You'd have to have experience in circuitry."
No suspects are in custody, but Monroe authorities said they have leads.
Erik Chappell and his two sons, 13-year-old Grant and 11-year-old Cole, have gone through months of physical therapy since the incident. The father was honored with the "Adult Good Samaritan Hero" award last Thursday for saving his sons' lives.
"There's a lot of people that have helped us get to the point that we are todayâ?¦ We're doing well, we're doing well," Chappell said at the event.The reward for information that leads to an arrest and conviction has been raised to $20,000. Anyone with information should call 1-800-ATF-BOMB.
Read more: Monroe Evening News