Japan’s fourth avalanche in two days buried three mountain climbers on a remote, icy peak today, as the country struggles through one of its snowiest winters on record.

Thai officials have issued a warning of a possible tsunami after an 8.2 magnitude earthquake struck in the sea off the coast of Sumatra, Indonesia.

Tens of thousands of Japanese huddled in makeshift emergency shelters today after a string of earthquakes in northern Japan flattened homes, toppled bridges and derailed trains, killing at least 21 people and reportedly injuring 2,000 others. Eight people were believed missing.