More than 400 people trapped by rubble in earthquake-stricken Tibet have been rescued, Chinese officials said, with an unknown number still unaccounted for in freezing weather a day after a strong tremor rocked the Himalayan foothills.

Rescue workers in China ’s mountainous Tibet region are racing to reach survivors trapped under the rubble as night temperatures drop far below freezing point following a powerful earthquake.

Authorities moved more than 47,000 people to shelters in earthquake-hit Tibet, Chinese officials said on Thursday, while rescuers widen a massive combing effort for survivors near the foothills of the Himalayas,