On Friday, Providence police will hold a press conference to announce the conclusion of an operation that resulted in the seizure of 20 firearms, including seven ghost guns, and 44 pounds of marijuana. Mayor Brett Smiley and Chief Oscar Perez will address the media at the Providence Public Safety Complex at 11 a.m. The press conference will be streamed live by 12 News. Stay up-to-date by downloading the 12 News App for breaking news alerts on your phone or tablet.