Honolulu police say a 54-year-old man was injured after an unknown suspect struck him in the chest with a homemade dart in Chinatown Wednesday night. Police and Emergency Medical Services personnel responded to North Hotel Street at about 10:15 p.m. The victim was taken in serious condition to a hospital where he underwent surgery for his injury. Police have opened a second-degree attempted murder investigation. There are no arrests at this time. A description of the suspect was not immediately available.