(CNN) — Indonesian rescue teams are frantically searching for scores of young students buried for two days under concrete rubble after their Islamic boarding school collapsed on them during afternoon prayers.

In one pocket of the mangled concrete of the collapsed century-old Al Khoziny boarding school, authorities located six children alive and were running food, water and oxygen to the trapped group.

But in total, at least 91 people remain missing, feared under the rubble, Indonesia’s National Disaster Management Authority (BPBD) said late Tuesday. At least three people have died, and 100 others were injured.

Indonesian officials have warned that time is running out to reach those still alive as the mammoth rescue operation entered its third day on Wednesday.

Laksita Rini, head of

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