They say he asked a 15 year old student .. for nude pictures of himself. An Alachua County teacher and swim coach is in jail in Gainesville. 31-year-old Joseph Diaz has been arrested in an investigation of sex crimes involving children. Now, more potential victims are coming forward. Channel 4's Vic Micolucci is looking into it .. and joins us now with more on the charges Diaz is facing. Vic. 3 3 Diaz was arrested yesterday, accused of having child pornography and promoting it with a minor. That stems from an inappropriate relationship with a 15-year-old boy... He bonded out today...and then was arrested AGAIN because police say more potential victims came forward. So now, detectives say there are three underage victims... The crimes are believed to have been going on for years. According to records I found, Diaz was a swimming coach at the Makos Aquatics Club and he was also a behavior resource teacher at High Springs Community School. Investigators say he had an inappropriate relationship with one boy for several years ... asking the child to take nude pictures and videos of himself on his cell phone. 3 3 00-10 00:16 our investigation revealed that this relationship began when the victim was 11 years old, and has progressed at you and point where there have been photographs taken of the of the young victim by the defendants cell phone.00:32 at this point there has not been any allegedly sexual contact between the two, but the investigation is definitely on going to see exactly what has transpired over these four years. 3 Detectives are worried there may be more victims, and are asking for anyone who may know anything about Diaz to come forward. The Department of Children and Families is also investigating.