BANGOR, Pa. (AP) — Parents and students say a Pennsylvania school district suspended about 15 students who took to social media during schools hours after two classmates wore Chick-fil-A shirts during a Gay-Straight Alliance event.

Bangor Area High School senior Erin Snyder tells The Morning Call newspaper the backlash began after two students appeared wearing the T-shirts last week on the school's morning TV announcement.

Some students felt the shirts were offensive because Chick-fil-A's CEO Dan Cathy made comments against gay marriage in 2012.

Offended students who took to Twitter were called to the principal's office.

Snyder, who was suspended, says they were told they were being punished for tweeting during school hours and because some of their messages contained obscenities.

The American Civil Liberties Union of Pennsylvania is investigating.