Massive search underway for missing child near Castle Island.

A search is underway for Mohemed Fofena, a 4-year-old boy with autism who went missing on Castle Island in South Boston. The boy's grandfather reported him missing after he couldn't find him when it was time to leave the park. Multiple agencies, including the Massachusetts State Police, Boston Police, Boston Fire, Massachusetts Environmental Police, and the U.S. Coast Guard, are involved in the search. Mohemed is Black and was last seen wearing a gray hooded sweatshirt, blue jeans, and blue footwear. Anyone with information is asked to call 911.