(Warwick, RI)--Maribeth Calabro, the president of the Providence teachers' union, is apologizing over a Facebook post alleging racism at a basketball game in Warwick.Calabro said she was copying from someone else's page who had alleged racist language directed at Mount Pleasant High School students during a girls' game at Pilgrim High School earlier this week.A joint investigation by the superintendents of both schools found no evidence of any race-related remarks or comments from the game.In a letter directed to Warwick Public Schools Superintendent Phil Thornton, Calabro apologized for re-posting something without having evidence.