An Ohio man is in custody after he allegedly tried to bring weapons and ammunition into a screening of The Dark Knight Rises in a Cleveland suburb on Saturday.

Police say an off-duty cop became suspicious when he saw a man carry a satchel into the Regal Cinema in Westlake and sit down by himself in the theatre showing the Batman movie half an hour before showtime, the Cleveland Plain Dealer reports.

Officer Jeremiah Bullins asked if he could search the man's bag and found a loaded Glock 9-mm handgun, two clips of bullets and three knives, as well as another knife on the man, police told the newspaper.

That led police to get a search warrant for a home, where they found rifles, handguns and what's being called "survivalist gear" like gas masks and bulletproof vests, the newspaper reports.

Scott Smith, 37, is charged with carrying a concealed weapon and three other weapons offences.

Police and many moviegoers are on edge after the mass shooting that left 12 dead and more than 50 people injured at a midnight screening of The Dark Knight Rises on July 20 in Aurora, Colo. James Holmes, 24, is charged with 24 counts of first-degree murder and 116 counts of attempted murder.