By Aman Ali

NEW YORK (Reuters) - A man accusing former Syracuse University assistant basketball coach Bernie Fine of molesting him was in jail on Wednesday for violating bail conditions in his own child sex abuse case, police said.

Zach Tomaselli, 23, who is charged in Maine with sexually assaulting a 13-year-old boy, was arrested on Tuesday for violating a judge's ruling against any further contact with minors by giving a car ride to a juvenile, police said.

"We received information from a concerned citizen that he was seen in a vehicle with a person under the age of 18 which is a violation of his bail," said Lieutenant Mark Cornelio.

"Officers investigated on Tuesday and determined they had probable cause to arrest him shortly after at his residence," he said. Tomaselli is in jail in Lewiston, Maine.

Tomaselli is one of three men who say they were sexually abused by Fine, former long-time assistant basketball coach to Syracuse Hall of Fame coach Jim Boeheim.

Fine, who was fired by the university but not charged with any crime, denies the allegations.

Tomaselli alleges he was 13 when Fine molested him in a Pittsburgh hotel during a Syracuse away game in 2002. Federal authorities are investigating Tomaselli's allegations. Tomaselli's father says his son is lying, and a district attorney who has investigated the accusation said last week he has doubts about Tomaselli's story.

He filed a lawsuit against Fine last week saying he suffered "severe mental anguish and horror."

In his own criminal case, Tomaselli is charged with sexual assault, exposing himself to a child and unlawful sexual touching. He told Reuters he plans to plead guilty and regrets the pain he inflicted on the boy at a Maine day camp where Tomaselli worked as a counselor.

Tomaselli's attorney could not be immediately reached for comment.

(Editing by Barbara Goldberg and Greg McCune)