The probe centers on changes made to the designation of the Vjosa-Narta protected landscape near Zvërnec, a coastal region known for its environmental significance.
Video from the scene showed protesters shouting insults and profanity at immigration officers while ignoring repeated warnings from police to leave the area.
“Unfortunately, what was presented to us as a celebration of our country has evolved into something much more divisive than what I agreed to be a part of.”