Parents are desperately searching for scores of missing teenage boys feared trapped under huge piles of concrete after an Islamic boarding school collapsed while students were praying inside in Indonesia. Authorities said 91 people were listed as missing after the Al Khoziny school building collapsed during late afternoon prayers in a mosque. The mosque was housed on a lower floor of a building in which the upper floors were still under construction. Know the news with the 7NEWS app: Download todayThe boarding school is in the East Java town of Sidoarjo, about 780km east of Jakarta. Three people are dead, 99 others are in hospital and scores of students are still missing after a school building collapsed in East Java.