Rescue workers used excavators Thursday to pull out victims, some screaming in pain, from the heavy rubble of buildings felled by a powerful earthquake that killed at least 531 people. The death toll was expected to rise.

The brunt of Wednesday's 7.6-magnitude earthquake, which originated in the sea off Sumatra island, appeared to have been borne by Padang town where 376 people were killed. Four other districts accounted for the remaining deaths.