It's hard to compare a mostly lawful obedient society such as Switzerland to the U.S.; also I think that there are provisions that they have to be unloaded and locked up. Nevertheless, mass shootings have happened and mental illness has no borders.<quoted text>
Nearly every household in Switzerland has a gun, many are full-auto capable military assault rifles. Don't know of any similar incidences there.
Mass shooting reveals dark side of Swiss society
By Peter Schwarz
9 October 2001
Just after 10am on September 28, Friedrich Leibacher made his way into the parliament building of the Swiss canton of Zug and unleashed a bloodbath. In total, 14 people were shot dead. Three of the seven members of the local Zug government were killed, and another was seriously wounded. Eleven of the 80 members of the canton council were shot dead and numerous others wounded. Two journalists were also badly injured.
The 57-year-old Leibacher entered the lakeside government building dressed in an army jacket bearing a “Police” insignia. Apart from a combat rifle, he was also armed with an SIG-Sauer pistol, as well as Remington and Smith & Wesson revolvers. He ran up the stairs to the council chamber and cried,“Attention! This is a police operation”. He then shot three people standing in front of the room before bursting into the chamber, where he opened fire for about four minutes, shooting deputies, government members and journalists, cursing them the whole time. He fired over 90 shots in all.