At least one person was confirmed dead after a building under construction collapsed ​in the Philippines on Sunday, authorities said, as rescuers scoured ​the rubble for 21 people listed as missing.

Officials said an ⁠investigation had been launched into what caused the collapse of the multi-storey building in the city of Angeles, north of the capital, Manila.

Rescuers at the scene could be seen clambering over a mound of concrete slabs and mangled steel as they searched for survivors. They used trained rescue dogs, heartbeat detection devices and heavy equipment to sift through the debris.