Authorities have made an arrest have a number of ballots were damaged when a United States Post Office collection mailbox was lit on fire in Phoenix, police said.An individual lit a fire inside a drive-up collection mailbox at a USPS station early Thursday morning, according to the Phoenix Police Department, which said it responded to the scene at 1: 20 a.m. The Phoenix Fire Department was able to open the mailbox and extinguish the fire and the Postal Inspector took possession of the damaged ba