MUKWANAGO, WI – Mukwonago police say vandals smashed the windshields of the entire fleet of the city's 13 postal vehicles, according to the Associated Press. Postal inspector Lori Groen says the damage appears to have been inflicted either late Sat., March 25, or early Sun., March 26. She says nothing was stolen. A $5,000 reward is being offered for information leading to a conviction, according to the Associated Press. A spokeswoman says the vehicles were either repaired or replaced March 27 so there was no delay in mail service. The damage is estimated at more than $5,600. Mukwonago Police Chief Fred Winchowky said police have no suspect, according to the Associated Press.