GIG HARBOR, Wash. -- A Washington state high school student is back in school after a three-day suspension for warning classmates about a sex offender on campus, reported Seattle TV station KIRO.

Last week, Raydon Gilmore found a 16-year-old fellow student at Gig Harbor High School listed at the Washington State Sex Offender Information Center, a Web site that lists the state's level 2 and level 3 sex offenders.

"Then it hit me that I was in P.E. freshman year, and this kid was there for a while and he was my neighbor at my locker," Gilmore told KIRO.

The 16-year-old was convicted of indecent liberties and using force.

Gilmore made copies of the announcement and started handing them out to classmates "to let them know that we're going to school with dangerous people and to be more aware." Three other students helped create and distribute fliers. He said minutes later, the school's principal caught up with him.

Gilmore was suspended for three days. School officials said the fliers amounted to harassment and he was interfering with other students' education, according to school documents.

"I'm frustrated that my son does something right and good and something I'm proud of, and he's being punished for it," said Meloney Garthe, Gilmore's mother.

Gilmore said he believes he did the right thing, and would do it again.

The school's principal told the News Tribune of Tacoma that the students should have brought their concerns to a teacher or an administrator. He said the students misused school property and they violated a rule that state officials must approve any materials that students post on campus walls.