Rescuers will try to reach a primary school engulfed by last week's landslide in the Philippines, after its roof was spotted in aerial photographs.
The school is thought to have been swept 300m from its original site
There is still "a possibility of life under a sea of mud and rocks" the local governor said as she announced details of the mission to take place on Friday.
More than 240 pupils and teachers are believed to have been in the building.
The official death toll stands at 129, based on the number of bodies found, but the final toll could pass 1,000.
Officials believe the roof came from the building because of its colour and elongated shape.
A former resident of Guinsaugon village will be brought to the site to identify it, Governor Rosette Lerias told a news conference on Thursday.
"It resembles very much the green roof of the elementary school that we've been looking for," she said.
"It has moved some 300 metres away. It is in the same place that they found some notebooks, religious texts and also some pictures."
Efforts to locate the school have been continuing after unconfirmed reports that survivors sent mobile phone text messages from inside the building shortly after the landslide.
The area where the roof is thought to be located is unstable and there is the possibility of further landslips.
Special monitors are being drafted in and preparations made to evacuate the rescuers if necessary.
Much of the mud throughout the 40-hectare (100-acre) disaster zone remains unsettled, especially after the continued rains.
"We know there is real danger," Ms Lerias said.