An explosive device was intentionally placed inside a mailbox on the 13700 block of Gregg Neck Road in Galena, on Saturday, Jan. 4, around 9:30 p.m., according to the Maryland State Fire Marshal’s Office. The device detonated inside the mailbox, blowing apart the box and its post, officials said. No one was injured. The explosion was discovered by the homeowner, and deputies from the Kent County Sheriff’s Office launched an investigation, the Fire Marshal’s Office said. Investigators determined the blast originated inside the mailbox, and the preliminary cause was ruled incendiary.