SIDOARJO,⁢ Indonesia – Rescuers pulled a survivor from the ruins ⁢of⁢ a collapsed school in Indonesia on Wednesday, as desperate parents demanded that searchers speed‍ up efforts to find dozens more still ⁢believed trapped in the rubble.

Part of the multi-storey school ⁤on the island of java gave way suddenly on Monday, as students gathered for ‍afternoon⁣ prayers.

On ⁤Wednesday, rescuers said they had retrieved a survivor and⁢ a fourth body from the ruined building, but gave no details on either.

Based‍ on school records “91 people are suspected to be⁤ buried”, National Disaster and Mitigation Agency ⁤spokesperson Abdul Muhari said in a statement late Tuesday.

Tearful parents milled ⁣near the ​ruins throughout Wednesday, awaiting news⁣ of their children.

“We believe our children might still⁣ be‌ alive because they were crying for help,” said father abdul Hanan, whose 14-year-old son is missing. “The ​rescue⁤ operation must be accelerated.”

“We are racing against time now,” the 45-year-old added, bursting into tears.

Nearby, Dewi sulistiana was awaiting ​news of her 14-year-old⁣ son she was last in touch with on ⁤Sunday.The⁣ boarding school limits student access to cellphones.

She rushed to the scene from ​Surabaya, several dozen kilometres ⁢(miles) away, after hearing about the collapse.

“I ‍have been ‌here for days. I cried​ thinking about my son,” she told AFP. “Why‌ is⁢ taking ​so long ​to find him, ​why is the search so slow? I haven’t had‌ any updates, so I just wait.”

Tunnels ‌and drones

The rescue‌ operation is complex,said Mohammad Syafii,head ⁣of the National Search and Rescue Agency.

“If ‌vibration happens in one spot, it ​could affect othre parts of the building,” he explained.