Most organizations who track mass shootings limit their consideration to incidents that involve at least four fatalities, and consequently, Baltimore doesn't show up on any of their lists. But that's largely a matter of luck (or, to some degree, the city's excellent trauma care). Mass Shooting Tracker, a crowdsourced database, looks instead at incidents in which four or more people are shot, regardless of whether they die. Baltimore showed up on its list five times in 2013, one time in 2014 and eight times already in 2015. (Tuesday's elementary school shooting will make nine.) This year, only Chicago has had more mass shootings, with 13. As of Oct. 3, Baltimore had logged 724 total shootings for the year, up 81 percent from the same period in 2014, according to Open Baltimore data.