In the area's second fatal shooting in as many days, a man was shot and killed on San Francisco's Sixth Street this morning, just a block or so away from where President Barack Obama is staying during his brief visit to San Francisco.

According to San Francisco Police department Sergeant Danielle Newman, at about 11:07 Tuesday night, "a patrol unit was flagged down in the area of 6th and Mission regarding possible shots fired."

A second patrol unit found the victim, a 25-year-old man, suffering from a gunshot wound to the chest, Newman says.

He was transported to San Francisco General Hospital, where he died of his injuries. He has since been identified as Pacifica resident Marc-Anthony Salumbides.

Meanwhile, just a block away from the scene of the crime, President Obama was settling in at the InterContinental Hotel at Howard and Fifth Streets, having landed at San Francisco International Airport at 9:20 that evening. As noted by photographer Steve Rhodes, there was a significant police presence in the area, but apparently not a presence significant to deter this crime.

It's unclear if Tuesday's homicide is related to the slaying of 18-year-old Daniel Beltran, who was killed just steps away from this last night's shooting. Beltran was gunned down, the Chron reports, at the Henry Hotel at 106 Mission Street. As of Wednesday morning, SFPD did not have any new information on Beltran's death, or on any suspects in the case.