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Members of the San Jose Police Department investigate the scene of a fatal stabbing on North Second St. and East St. John St. in downtown San Jose, Calif. on Wednesday, March 19, 2014. This is city's 10th homicide of the year. (Gary Reyes/Bay Area News Group)

SAN JOSE -- In the second homicide in as many days, a man was fatally stabbed early Wednesday morning in downtown.

Police says a passer-by spotted the man face down on a sidewalk in the area of Second and St. John streets and called police at 2:49 a.m. He was pronounced dead a short time later.

The man, who was not immediately identified, is the city's 10th homicide victim of 2014. Police Sgt. Heather Randol said he was in his late 20s or early 30s. There were no suspects apprehended or identified.

"We don't know what precipitated this homicide," Randol said.

Police are looking for anyone who may have witnessed what led up to the stabbing, which occurred near St. James Park.

"We do believe there are people who could have seen what happened," Randol said.

As part of their investigation, police remained in the area for hours. For much of that time, light rail trains did not stop at the St. James Station.

It was the second homicide in San Jose this week.

On Tuesday a man in his 20s or early 30s was found shot to death inside a home in the Coyote Creek neighborhood in South San Jose.

Police are asking for anyone who may have witnessed the downtown killing to contact them at 408-277-5283.