D.C. police say they denied a request by NBC to use a high-capacity gun magazine on "Meet the Press" before NBC News reporter David Gregory pulled out what he said was that type of magazine on the program.

Police are investigating whether Gregory violated D.C. gun laws during the program, which was taped in Washington and aired Sunday.

D.C. Police spokeswoman Gwen Crump said police discussed the use of the clip with NBC before Gregory the program was taped.

"NBC contacted MPD inquiring if they could utilize a high capacity magazine for their segment. NBC was informed that possession of a high capacity magazine is not permissible and their request was denied," according to a statement released by Crump. "The matter is currently being investigated."

D.C. Police spokesman Officer Araz Alali said Wednesday that he could not get into any specifics about the investigation.

NBC officials did not immediately respond to a request for comment.

Gregory was interviewing National Rifle Association CEO Wayne LaPierre about the deadly shooting at Sandy Hook Elementary School in Newtown, Conn., that left 27 dead, including 20 children.

"Here is a magazine for ammunition that carries 30 bullets," Gregory said while holding up a clip. "Now, isn't it possible if we got rid of these, if we replaced them and said, 'Well, you can only have a magazine that carries five or 10 bullets,' isn't it just possible that we could reduce the carnage in a situation like Newtown?"

LaPierre said he didn't think a ban on high-capacity magazine clips would make any difference.

High-capacity ammunition magazines are illegal in the District of Columbia. It's unclear whether the magazine Gregory displayed was real or just a prop.

"No person in the District shall possess, sell, or transfer any large capacity ammunition feeding device regardless of whether the device is attached to a firearm," according to D.C. Criminal Code 7-2506.01.

A person found guilty can face a fine of up to $1,000 or a year behind bars.