DOWNTOWN LOS ANGELES (KABC) -- One person was killed in a shooting at a luxury high-rise building in downtown Los Angeles, police say.Authorities were called on an alarm at the WaterMarke tower at 705 W. 9th Street.Fire department paramedics found a shooting victim on scene and called police to respond. The victim was pronounced dead.The circumstances of the shooting and a description of any possible suspects were not immediately available.Police believed the suspect was no longer in the building.