OTTAWA - Canada's largest movie theatre company will beef up security at upcoming Toronto showings of the The Dark Knight Rises after a gunman killed 12 people and injured as many as 71 during a screening in Colorado on Friday.

Cineplex Media said it believes the tragedy was an "isolated incident," but the movie company has opted to take precautions.

"We are shocked and saddened by last night's tragedy in Aurora, Colorado, and extend our deepest sympathies to the family and friends of those affected," Cineplex said in a release.

It will also donate a portion of Friday's box office proceeds to a Red Cross program aimed at preventing violence and abuse, called RespectED.

Security is also being bolstered at theatres in Europe and the United States, including in New York.

"As a precaution against copycats and to raise the comfort levels among movie patrons in the wake of the horrendous shooting in Colorado, the New York City Police Department is providing coverage at theaters where the 'The Dark Knight Rises' is playing in the five boroughs," the force said in a press release.