The FBI says it has foiled a planned New Year’s Eve attack in North Carolina, arresting an 18-year-old accused of pledging allegiance to the Islamic State group. Authorities allege the suspect shared attack plans with an undercover FBI agent and possessed a manifesto outlining plans for a knife-and-hammer assault. Investigations began after extremist content was flagged on social media. The accused remains in custody and is due in court on January 7.