About 20 employees of a Cedar Falls photo-processing shop developed the prom pictures from Columbine High — the site of this week’s school massacre. Mark Latin, owner of Latin Photography, says the rolls of film from the prom arrived in Cedar Falls on Tuesday, the day of the shootings. Latin says they put a rush on the processing — and the nearly one-thousand prom pictures were back in Littleton Thursday morning.Latin says it was heart-wrenching work. Latin says authorities told them one of the suspects was in one of the photos.