A four-year-old boy is in critical condition after falling from the ninth-floor balcony of a condominium in Naha, Okinawa Prefecture, on Tuesday afternoon. Police said the child plunged at about 2:40 p.m., landing on a roof that extends over the building’s second floor. He suffered severe head injuries and was rushed to a nearby hospital, where he remains unconscious. The boy’s mother alerted authorities, telling dispatchers that her son had gone over the balcony. Investigators are interviewing family members and examining the apartment to determine how the child accessed the railing. The building sits on a busy thoroughfare in the city’s Shintoshin commercial district.