Police were alerted late on Sunday evening to reports that several shots had been heard in Erpeldange-sur-Sûre.
A patrol made its way to the scene immediately. After further investigation, officers managed to locate a suspicious person in an establishment in Ettelbruck.
A search of the suspect's backpack revealed a blank pistol, ammunition for the weapon, and two folding knives.
On the orders of the public prosecutor's office, the man was subsequently taken to a closed psychiatric facility.
