Those close to Mollie Tibbetts are urging anyone who may have seen or know anything about the Iowa college student’s disappearance to come forward. “The bottom line is somebody knows something,” Rob Tibbetts, Mollie's father, told Fox News Channel Wednesday. She was last seen Wednesday, July 18, after going for a jog in Brooklyn, located about 60 miles east of Des Moines. The 20-year-old was staying in the small city to dog-sit at her boyfriend’s home, which she may have left unlocked.