Seventeen people were killed and five others injured after an annex to a hotel collapsed in Suzhou, east China's Jiangsu Province, local authorities said on Wednesday. 

The incident occurred in Suzhou's Wujiang District at approximately 3:33 p.m. (0733 GMT) Monday, during which 23 people were trapped, according to the rescue headquarters. The rescue operation ended at 9 a.m. (0100 GMT) Wednesday.

An investigation has been launched and is being supervised by the State Council Work Safety Committee. Local police have taken criminal coercive measures against the people responsible for the collapse.

The collapse was caused by an unauthorized renovation, said the government of Wujiang District, citing preliminary investigations.