Reigning box office champ “Rules of Engagement” edged out the new Sandra Bullock drama “28 Days” for the top slot at North American cinemas, according to studio estimates issued on Sunday.

“Rules” (Paramount Pictures), a military legal drama starring Tommy Lee Jones and Samuel L. Jackson, pulled in about $10.9 million for the Friday-to-Sunday period, taking its 10-day total to $30.6 million. More