DENVER (CBS4)– An Aurora man has been arrested for possessing a firearm after allegedly shooting it during a protest in Denver in May. Felix Missael Alva made his initial appearance in federal court on Monday afternoon.

Police say Alva, a Mexican national, was witnessed by a detective in Denver shooting a semi-automatic weapon into the air.

In June, officers executed a search warrant on an address in Aurora and found the weapon in question. Law enforcement also found that Alva was not legally in the U.S. That prohibits Alva from having weapons.