German police say they have arrested a 16-year-old Afghan boy for allegedly having been aware of the planning of Friday’s mass shooting in Munich but failing to report it. The teen, who has not been identified, was questioned by police after he contacted officials in the wake of the shopping-center attack that left 10 people dead, including the gunman. Police said they opened an investigation into the boy’s possible involvement after he made contradictory statements. “There is a suspicion that the 16-year-old is a possible tacit accomplice to [Friday’s] attack,” a police statement said Sunday. Specifically, the boy may have posted an announcement on Facebook inviting people to a cinema near the Munich train station, a post similar to a social-media announcement made by the gunman in order to lure visitors to the scene where he opened fire.