07:22 BST
Astudestra Ajengrastri
BBC News Indonesia
Al Khoziny, the school which collapsed on Monday, is a pesantren – a traditional Islamic boarding school in Indonesia.
Enrolled students live, study, and practice religion under the guidance of a religious teacher.
Traditionally, pesantren focus on Islamic studies, such as memorising the Quran, learning Arabic and Islamic law.
But now many pesantren also offer general education.
Unlike regular schools, pesantren fall under the authority of Indonesia’s Ministry of Religious Affairs, not the Ministry of Education.
Oversight is often limited. Many pesantren operate informally, without strong regulation or consistent monitoring.
The religious affairs ministry’s East Java office said on Tuesday that the collapse was a lesson about safety standards on the construction of religious schools.
The ministry, which expressed its “deepest condolences”, also pledged to strictly monitor government assistance to the disaster’s victims.