US and Malaysian officials say high-tech gear has detected sounds at the site where a Philippine school was swallowed by a landslide.
It's unclear whether the sounds were made by survivors or whether the soft, unstable mud covering the school is shifting and settling.
The search for survivors from the landslide that swamped the farming village has focused on the school. There have been unconfirmed reports some of the 250 to 300 children and teachers inside when the landslide hit may have sent cell phone text messages to relatives soon after the disaster.
A US Marine involved in the search says "We know there's something down there."