Because of 11 grave accidents in the past few years, 117 people have been sent to judicial departments and 166 given Communist Party or administrative penalties, including two provincial officials.

The State Administration of Work Safety announced the investigation results of the accidents at a press conference on Thursday.

Among the accidents, a passenger aircraft of the China Eastern Airlines crashed in Baotou City of north China's Inner Mongolia Autonomous Region on November 21, 2004, leaving 55 people dead.

Li Fenghua, chairman of the airlines company, was given administrative warning. And Luo Chaogeng, general manager of the company, was recorded a serious administrative demerit.

Investigation showed the air crash was caused by pollution on the wings, probably by frost pollution.

Source: Xinhua