Reshoots for “Gangster Squad” are starting this week in Chinatown after Warner Bros.’ decision last month to reconceive a key scene in the film due to similarities with the July 20 shootings in Aurora, Colo.

Permitting agency FilmL.A. issued a “notice of filming” to the Chinatown area for an untitled production, with lensing taking place Tuesday, Wednesday and Thursday, with the following scene description: “Exterior automatic, single-shot and semi-automatic full-load gunfire (gun battle), simulated bullet effects on body. Truck explosion. Firecrackers.”

The reshoot covers a pivotal setpiece in which thugs spray machine-gun fire into a crowded movie theater from behind the screen. Warner announced five days after the Aurora shootings that it would bump back the release date of “Gangster Squad” from Sept. 7 to Jan. 11.

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FilmL.A. also reported Tuesday that offlot production stayed moderate last week with 675 permitted days, up two days from the same week of 2011. TV shoots remained the mainstay with 399 days as “Jimmy Kimmel Live” racked up the most days with 28. Other shows lensing include “The Next” with a dozen days, “Dexter,” “CSI: NY,” “The Millionaire Matchmaker,” “Raising Hope” and “Modern Family.”

Feature film activity cooled off, sliding 53 days to 129. Three pics led with a dozen days each — “Feed the Dog,” “Double Decker” and “Uncanny” — and other feature projects included “Afternoon Delight,” “Birds of Paradise” and “Paranormal Event.”

A Ford spot was the most active commercial shoot with 15 days.