LOS ANGELES — Law enforcement officials plan to continue an undercover presence in Los Angeles-area movie theaters through at least Sunday, as “The Dark Knight Rises” opened to a very strong $249 million worldwide.

The news came as Warner Bros. confirmed Monday that “The Dark Knight Rises” grossed $160.9 million in the United States and Canada from Friday through Sunday and an additional $88 million overseas in the first 17 countries where it debuted.

For the first time in many years, most major studios did not release box-office estimates Sunday out of concern about appearing insensitive to the news that 12 people had been killed and 58 wounded early Friday at a post-midnight screening of “The Dark Knight Rises” outside Denver.