More than 20 injured in blast at tunnel construction site in western China

More than 20 people were injured in an explosion at a tunnel under construction in western Sichuan province in China.

The blast occured near the Luodai Ancient Town near Chengdu, a popular tourist destination, at about 1.20 pm on Tuesday, the China News Service reported.

Photographs circulating on social media, uploaded by witnesses, show a cloud of debris and smoke rising above the hill behind the town.

One witness said large amounts of dust had fallen on people and vehicles, the report said.

The blast also caused serious damage to a nearby temporary dormitory for workers.