HOUSTON -

Houstonians wanting to see the newest Batman film are rethinking when they'll see it after a gunman opens fire in a Colorado theater, killing a dozen people and wounding many more.

Edwards Cinemas showed the "The Dark Knight Rises" as early as 3 a.m. Friday in Houston. Patrons could not believe 12 people were killed and dozens more were injured during a showing of the movie in Aurora, Colo.

"It's crazy. It's absolutely insane. Who would go out and do crazy things like that?" Christopher Lacy said.

Some said they will be more careful when going to a movie.

"Definitely, you know, after hearing what happened last night. You kind of start looking over your shoulder," Joe Lopez said.

"You're so desensitized in the theater. There's so much noise, so much sight. It's something you can't really answer until you're in the moment. It all kind of sticks in the back of your head. It's really hard to not think about it," Brian Zeolla said.

Some said they may go to movies at different times now.

"We were thinking maybe we'd go tonight, but then we were thinking maybe we should go during the day," moviegoer Sandeep Abraham said.

Witnesses in Colorado described the 24-year-old gunman, who police identified as James Holmes, as being dressed in full riot-type gear, similar to the villain in the "Dark Knight" named Bane.

"I guess the guy knew there were going to be a lot of people coming to that one spot," Abraham said. "Easier for him to target more people."

Some employees at a Houston movie theater said security is normally beefed up for big premieres because of the larger crowds expected. They said there is a police and security presence 24 hours a day.

Some moviegoers said they would like to see more security measures at all theaters all the time.

"He walked in undetected and shot all of those people," moviegoer Yolanda Armstrong said. "Maybe they need to change the way movie theaters are wide open."

"It's an inconvenience, but in the end we want to come out here and not worry about someone in the bathroom pulling out guns and ready to shoot us," Abraham said.

Sources told KPRC Local 2 that the Edwards Cinema at Greenway Plaza will have eight additional security guards there from 6 p.m. to 2 a.m.

Colorado law enforcement officials said the Aurora mass shooting was an isolated incident.

Edwards Cinemas has no connection to the Colorado movie theater where the shootings occurred.