San Francisco police are investigating an early-morning homicide where a man in his 20s was stabbed to death.
According to police, the call came in at about 3:18 a.m.; police responded to an apartment building on the 1700 block of Market Street where they found a man's body in the lobby of the building, ABC News reports.
Paramedics pronounced the man dead at the scene.
Police told the news station that they are questioning three suspects in the case and the building is under lockdown.
The Medical Examiner's Office has not yet identified the victim.