At least 91 students remain trapped under rubble nearly two days after an Islamic boarding school collapsed in East Java, Indonesia, during unauthorized construction work.

The century-old al Khoziny school fell Monday while hundreds of students were praying, leaving at least three dead and about 100 injured.

Authorities raised the number of those missing after reviewing attendance records, as more than 300 rescuers continue efforts to free survivors, the Associated Press has reported.