THE South African Rugby Football Union on Wednesday said they will investigate allegations that members of the under-19 squad returning from the FIRA Junior World Championship in Wales misbehaved on the flight. “We view these allegations in a very serious light,” Sarfu CEO, Rian Oberholzer said in a statement. “We cannot allow any behaviour that will jeopardise the positive image of South African rugby.” It is not clear what actually occurred on the flight. The under-19s came third in the event.