Two people were stabbed Wednesday night at the Downtown Crossing T station, MBTA spokesman Joe Pesaturo said. The stabbing took place at 10 p.m. following an argument involving three parties, all males, on the southbound platform of the Red Line at the station, Pesaturo said. The two victims were transported to a local hospital with injuries not believed to be life-threatening, he said. The suspect fled, and police were searching for him. Boston police could not be reached late Wednesday night for comment, and no further details were immediately available.