KUNMING - Nineteen workers that were trapped in a collapsed tunnel Tuesday afternoon were rescued on Wednesday evening in Southwest China's Yunnan province, local government said.

Nineteen workers that were trapped in a collapsed tunnel Tuesday afternoon were rescued on Wednesday evening in southwest China's Yunnan province. [Photo/Xinhua]

The collapse occurred at 4 pm Tuesday at the entrance of a road tunnel that was being built in Xianggelila County, Diqing Tibetan Autonomous Prefecture, said a spokesman with the prefecture.

The rescued workers were sent to a hospital in Xianggelila for health checks and results showed that they suffered no injuries, though they were exhausted after being trapped for 28 hours.

Initial investigations showed that unstable geological conditions had caused the accident, according to the spokesman.

A worker receives medical treatment at a hospital on March 30, 2011. [Photo/Xinhua]