An official says three people have been killed in a shooting Harford County, Maryland. The site is believed to be a Rite Aid Distribution Center. The law enforcement official has knowledge of the shooting but wasn't authorized to discuss details by name and spoke on condition of anonymity to The Associated Press. NBC News reports their sources in law enforcement say the shooter is "down" and that the shooter is woman. The Harford County Sheriff's Office will hold a press conference at 11:45.