The National Human Rights Commission has sent notices to the Kerala government and the state police chief over reports of killing of many political workers in the state.

The NHRC has observed that difference of opinion and healthy criticism are integral part of a multi-party democratic political system, but "bloodshed in the name of political and ideological differences is neither ethical nor acceptable in a civilised society".

The commission has asked the state government, through its chief secretary, and the director general of police to take effective steps to stop such killings, and has sought detailed response from the two in four weeks, the NHRC said in a statement yesterday.

The commission had taken cognisance of the matter on the basis of a media report on the gruesome killing of RSS and BJP workers in Kerala.