A city neighborhood is living in fear after a 13-year-old girl was raped in a popular historic local park Thursday — as sex assaults have more than doubled in the community over last year. Police are still looking for the fiend who dragged the young teen into Van Cortlandt Park in North Riverdale in The Bronx and viciously attacked her before running off — a crime that occurred amid a disturbing recent 120% spike in sexual attacks in the area.