SAN DIEGO (FOX 5/KUSI) -- A serious traffic collision prompted a road closure in Mira Mesa Friday morning, officials with the San Diego Police Department confirmed. The incident, which involved a vehicle and a pedestrian, occurred shortly before 5:30 a.m. on Black Mountain Road at Gemini Avenue. Police initially said the pedestrian was transported to a local hospital, though a later update confirmed the victim's death. Their identity has not been released at this time. Authorities said Black Mountain Road will be closed from Galvin Avenue to Mira Mesa Boulevard for roughly three hours as the scene is investigated and cleaned up. Motorists are encouraged to use alternative routes. No further details were immediately provided regarding the circumstances leading up to the fatal collision. This is a developing story. Please check back for more details.