The U.S. Postal Service is now offering a $100,000 reward for information on that bomb that was sent through the mail.
31-year-old Aaron Mustin, the co-owner of Cal-Air Cooling & Heating in Visalia suffered minor injuries to his hands and arms as a result of the explosion.
U.S. Postal Inspectors say they're making progress but not enough to close the case, which is why they are now offering the $100,000 reward.
Renee Focht with the U.S. Postal Inspection Service said, “These investigations are like puzzles, we need to have all the pieces and we're asking the public for that piece of the puzzle to complete it.”
Anyone with information on this case is asked to call the U.S. Postal Inspection Service at (877) 876-2455.
