These two were clearly unable to obtain guns so used weapons that are familiar to them. Is there a lesson here regarding restrictions on gun ownership?
Germany knife attack victims were all women -police (msn.com)
I got a John Stossel book packed up with my other books, but from his Libertarian point of view he attacked the various "Common Sense" notions of needing to regulate various things including firearms.
He pointed out that we went 80 something years without the regulation of rapid fire/ automatic firearms. (Basically the invention of the Gatling gun before the Civil War and the Maxim machine gun, the 1st modern machine gun dating back to something like 1885 or so).
It was government intervention that set the stage for the 1st gun ban, in the form of Prohibition, that made the criminal gangs get rich, and fight over territory and eventually go after the automatic weapons.
Before that, such weapons generally were impractical, and it was only the rich tycoons that out fitted their security forces with military grade weaponry as far as things like Gatling guns, canons and early machine guns. Where they had small armies that guarded their large estates.
Another interesting point, that people forget is the instrument of mass deaths in American. In Americas earlier past there were some horrible mass killings, these were not done by fire arms at all. Instead dynamite, black powder etc. was the culprit. But except for terrorist attacks like 9/11 our other mass shootings have not matched the body count of some of these early bombings where people blew up school houses, court houses, churches, and town halls in the 1800s to the 1920s dynamite that they got from a mining site or company etc.