Four executives have been ordered to account for their company's poor implementation of pollution control measures, the public security authority in Jinan, Shandong province, said on Monday.

Shandong Lvjie Energy Saving was told to stop production and dismantle its small coal-fired units after a visit on Sunday by an inspection team sent by the Ministry of Environmental Protection.

The team reported that the company's manual coal-fired boilers were not on a list of small coal-fired boilers that need to be eliminated, there was also no equipment to control dust and effluent gas in an electric welding production area, and the production area was responsible for large-scale noise pollution.

According to the public security authority, the head of the company, identified as Wang, refused to provide inspectors with information and instead locked them in a room for over an hour until police arrived. The case is being investigation.