LINCOLN, Neb. (AP) _ Nebraska swimming coach Cal Bentz and three assistants were suspended Friday for possible NCAA rules violations.

Bentz and assistants Keith Moore, Kelly Nordell and Rick Paine were suspended indefinitely pending an internal investigation, athletic director Bill Byrne said.

Byrne refused to comment further on the investigation or the possible violations. It is not known how long the internal investigation might take.

Bentz has coached Nebraska for 25 years, and the suspended assistants have been with the program for at least 13 years.

Fifth-year assistant Paul Nelson was made interim coach.

Bentz said he was told by university officials that he was suspended and was not given any explanation.