At least three men accused of making threats during or after watching the new Batman movie have been arrested in separate incidents, underscoring moviegoers' anxieties and heightened security in the wake of a deadly mass shooting at a Colorado theater showing the film.

Timothy Courtois of Biddeford, Maine, had been stopped for speeding, and a police search of his car found an AK-47 assault weapon, four handguns, ammunition and news clippings about the mass shooting that left 12 people dead early Friday, authorities said.

Police searched Courtois' home later Sunday and found a machine gun, several other guns and thousands of rounds of ammunition.

"Based on the arsenal that was confiscated, we brought in our counterparts from the FBI and ATF to assist with the investigation," said Steve McCausland, spokesman for the Department of Public Safety.

In Southern California, Los Angeles County sheriff's deputies were called to a cinema complex in Norwalk after moviegoers said 52-year-old Clark Tabor shouted: "I should go off like in Colorado." They said he then asked: "Does anybody have a gun?"

A security guard saw Tabor with a backpack on his knees in the second row, but deputies who searched the bag, the theater and its surrounding area did not find any weapon.

In Sierra Visa, Ariz. Michael William Borboa, 27, who appeared intoxicated was confronted during a showing of the movie. The Cochise County Sheriff's office said it caused "mass hysteria" and about 50 people fled the theater. Authorities said it contained an empty alcohol container and a half-empty moonshine bottle.