, June 9 -- Rescue teams continued searching damaged buildings in the southern Philippines on Tuesday to ensure no one remained trapped, a day after one of the country's strongest earthquakes in the last 50 years killed at least 37 people and forced more than 20,000 residents from their homes.

Authorities said only four people were officially listed as missing in the provinces near the epicentre of Monday's 7.8-magnitude earthquake. However, the Office of Civil Defense said several collapsed and severely damaged structures still needed to be thoroughly checked for possible survivors and additional casualties.

The earthquake struck off the coast of Mindanao, the Philippines' second-most populous island. Nearly 500 people were injured, wh...