This is the first time that Low Taek Jho has been officially named in the investigation. His location isn't known and he continues to move around the world freely. The police investigator also named two others, Mohammed Badawy Al Husseiny and Tan Kim Loong, who he said were persons of interest to Singapore investigators. Mr. Al Husseiny, an American, was chief executive of a company that allegedly had business dealings with 1MDB. Mr. Tan, commonly known as Eric Tan, was an associate of Mr. Low, according to people familiar with the matter.