Rescuers in Taiwan scrambled to free dozens of people trapped in highway tunnels after the island was struck by its strongest earthquake in 25 years Wednesday, killing at least nine and injuring more than 800 others.

The powerful 7.4 magnitude tremor shook the island’s east coast, hitting at 7:58 a.m. local time 18 kilometers (11 miles) south of Hualien city and at a depth of 34.8 kilometers (21 miles), according to the US Geological Survey. It was followed by several strong aftershocks with tremors felt across the island, including by CNN staff in the capital Taipei.

Taiwan’s National Fire Agency (NFA) said in an update on Wednesday that the death toll had risen to nine, while 882 people have been injured.