Exclusive Details

DC Comics is forbidding comic book retailers from selling the upcoming issue of a Batman comic book ... because it "contains content that may be perceived as insensitive" in the wake of the "Dark Knight" shooting in Colorado.

TMZ obtained an email DC sent comic book retailers last night asking them to HOLD the new issue of "Batman Inc." -- a fairly new comic book line featuring the Caped Crusader.

In the email, DC explains ... "Out of respect for the victims and families in Aurora, Colorado DC Entertainment has made the decision to postpone the release of BATMAN INCORPORATED #3 for one month because the comic contains content that may be perceived as insensitive in light of recent events."