UPDATE: Police say both Charlotte and Tristan McMahon have been safely located in Manitoba. They haven't said specifically where the two were found, and say they're still investigating the case.WINNIPEG — Police in Winnipeg say a Canada-wide warrant has been issued for the arrest of a 35-year-old woman accused of abducting her 12-year-old son. Investigators say Charlotte McMahon and her missing son, Tristan McMahon, were last seen in Winnipeg (in the area of St. James near Ness Avenue and Sturgeon Road) on Saturday morning. Tristan is described as white, five-foot-three, with a medium to heavy build, blue eyes and short brown hair. Charlotte McMahon is described as white, five-foot-four, 120 pounds, with a medium build, multiple tattoos and red shoulder length hair. Police say they are believed to be travelling in a black, four-door, 2014 Kia Forte LX with Manitoba plate GVW 620. Investigators say McMahon is known to have connections in Western Canada.