After divers unsuccessfully scoured the Charles River for eight hours, police suspended the search for an unidentified man who jumped off the Massachusetts Avenue bridge into the frigid water below around 3:30 a.m. Tuesday.

Authorities had closed the bridge to set up aerial search lights and combed the cold, dark water until sunrise, when divers gave up hope of rescuing the man alive, a Boston Fire Department official said. State Police divers continued to search for his body until just after noon.