The sources said the Ministry had asked the Pinarayi Vijayan state government to submit the detailed report on Rashtriya Swayamsevak Sangh activist Anand's killing on Sunday and police action thereafter.
Anand was hacked to death allegedly by Communist Party of India-Marxist workers in Thrissur district.
He was an accused in the murder of a CPI-M worker in 2014 and was out on bail.
Earlier in the day, the Bharatiya Janata Party condemned the killing and hit out at Kerala's ruling CPI-M dubbing its government as "Maoist".
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