As District of Columbia police investigate NBC News' David Gregory for apparently holding up a restricted high-capacity magazine on his weekly Sunday show, the police department claims NBC was told in advance that the prop was "not permissible." 

Gun laws in the nation's capital generally restrict the possession of high-capacity magazines, regardless of whether the device is attached to a firearm. Gregory, on "Meet the Press," held up what he described as one of those magazines during an interview with National Rifle Association CEO Wayne LaPierre. 

That incident has since led to an investigation. And Metropolitan Police Department spokeswoman Gwendolyn Crump claimed Wednesday that NBC sought permission ahead of the show, and was denied.