In addition to the savage stabbing of that teenager at 21st and Valencia last evening, there was another knife-crime incident in the Tenderloin yesterday afternoon. A 46-year-old man was stabbed in the neck with a pocketknife following an argument with another man.

The 40-year-old suspect, whom the victim presumably knew, fled on foot and has not yet been located. The incident happened near the corner of Ellis and Hyde just after noon Tuesday.

Anyone with information about the assailant is asked to call the tip line at (415) 575-4444 or text a tip to TIP411.