A suspect is being sought in an alleged arson incident at Vermont Sen. Bernie Sanders' Burlington office, police said. The fire was reported at 10:45 a.m. ET Friday in the vestibule between the elevator and the entrance door to Sanders' office, located on the third floor of 1 Church St., authorities said. A man entered the vestibule and "sprayed an apparent accelerant" on the door to the senator's office, lit the accelerant and then fled, according to the Burlington Police Department.