Madison police are investigating an explosive device that detonated inside a mailbox on the city's east side Thursday.
Officers were called to a property in the 7000 block of Bluff Point Drive at 11:39 p.m. and found a smoking explosive device and a suspicious leaking liquid.
The blast extended more than 6 feet, according to officers.
Police said the same victim, a 65-year-old man, had a window of his vehicle damaged about three weeks ago.
Anyone with information is asked to contact police.