Minneapolis (AFP) – Authorities in Minneapolis and its sister city St. Paul got reinforcements from the National Guard on Thursday as they girded for fresh protests and violence over the shocking police killing of a handcuffed black man.After stores were looted and burned overnight Wednesday in Minneapolis, officials in the so-called Twin Cities warned they would not tolerate violence while seeking to assure that investigations into George Floyd’s death were underway.Hundreds of people began marching in Minneapolis in the late afternoon, while in St. Paul, just to the east, police said there w…