(CBS) — A documentary about the man who’s been called Chicago’s Public Enemy Number One will not open as scheduled this Friday at a Chicago theatre, and the filmmaker says it’s because of fear of neighborhood gangs.

The film “Es El Chapo?” was supposed to have its Chicago premiere Friday at the Regal Cinemas City North on Western.

But not now, and it’s not entirely clear why that premiere was cancelled.

Filmmaker Charlie Minn says he got word from Regal Entertainment that the movie about former Mexican drug lord Chapo Guzman will not open.

“I guess they’re just afraid that there could be some incident at the theatre… I think they’re being over-cautious. I’m heavily disappointed by the decision.”

Minn says he was told the theatre is concerned about gangs in the area – and he says they’ve hired undercover officers.

But a spokesman for Chicago Police says police have had no conversations with the theatre involving this movie.

We’ve asked Regal Entertainment Group for comment.

Minn says he’ll look for another theatre.