Chaos after gunshots ring out at tree lighting ceremony

News Report Summary - A shooting occurred at a Christmas tree lighting ceremony in Concord, North Carolina [1] - Four people were injured in the shooting, including two suspects [1] Source Information - The news report is from NBC News Digital, which includes NBCNewscom, MSNBCcom, TODAYcom, Nightly News, Meet the Press, and Dateline [1] - NBC News provides breaking news, live video coverage, and original journalism [1]