Personally, I'm very grateful that the body count is low -- comparatively, of course.
Looking at the demographics of the town
White alone - 53,740 (58.9%)
Hispanic - 25,173 (27.6%)
Asian alone - 5,401 (5.9%)
Two or more races - 2,931 (3.2%)
Black alone - 1,796 (2.0%)
American Indian alone - 1,380 (1.5%)
Native Hawaiian and Other Pacific Islander alone - 708 (0.8%)
Other race alone - 73 (0.08%)
http://www.city-data.com/city/Sparks-Nevada.html
feral Amish were likely not involved.
Although looking at the school’s demographics the school’s population is
60% Hispanics
31% White
5% Asian
3% Black
2% Other
with 53% eligible for a fully subsidized lunch and 16% eligible for a partially subsidized lunch.
http://publicschoolsk12.com/middle-schools/nv/washoe-county/320048000247.html
Possibly a Mexican gang shooting?