ARLINGTON - A suspect was put in custody Friday but many parents of children at Coble Middle School say that's not the issue. They're outraged they weren't told an assault had taken place on campus.

Parents lining up to pick up their children Friday received something else - a letter. The more they read, the more disturbed they became: A young girl reported she was sexually assaulted at school.

But two weeks passed before the children were told what was going on. The school says they had to protect the investigation.

Counselors handed out the letter in the car lane. The letter detailed the reported the sexual assault of a 13-year-old girl on campus, during school.

"He had a valid reason to be on campus and chose to pull this girl into a locker room and sexually assault her," said Lt. Blake Miller from Arlington police.

But even more disturbing to one father was the date of the crime, Sept. 26.

"Two weeks is way to long. Two hours is too long. Parents need to know about this immediately," said Rich Greenberg.

Mansfield ISD spokesman, Terry Morawski, says the district's police officers were following the Arlington Police Department's lead.

"They went ahead and followed through with the investigation. We were just allowed to provide the information today," he said. "We were trying to find the right time to put something out," Lt. Miller said.

On Friday, Arlington police arrested Fredrick Ramone Wright, charging him with aggravated sexual assault and kidnapping.

He is the relative of a student at the school and had checked in at the office before being allowed on campus. He has not been on a district campus since the assault report.

"Basically, they felt this was an isolated incident so the students were not in any further immediate danger," said Morawski.

The district says that once the suspect was identified, officers made sure he was kept off campuses.

The suspect's fiancee said he is innocent and that he volunteered for a polygraph. She said he passed the polygraph.

A records search turned up no criminal history.