ST. PETER (AP) - A student organization says it posted provocative signs about illegal immigrants at a Minnesota college as part of a social experiment.

The signs were posted Monday at Gustavus Adolphus College in St. Peter and said ``white Americans'' had a ``civic duty to report any and all illegal aliens,'' calling illegal immigrants ``criminals.''

Students tore down the signs.

The Diversity Leadership Council, which represents 21 student groups at Gustavus, said a subcommittee of the group and a social justice theater troupe posted the signs. The group hopes the campus will reflect on the social experiment, but apologized to anyone who may have been hurt.

Dean of students JoNes VanHecke says the school was aware of the plan to post the signs, but probably should have told students beforehand.