The state views the act of Delhi Police, who raided the state-run guest house on October 26, "as one of total disregard of niceties and refinement by the police which is controlled by the Centre in a constitutionally federal structure," he said.
The Chief Minister maintained in the letter that the state would resort to legal action if it did not receive a satisfactory reply from the Centre.
"We are waiting for the reply from the Centre," Chandy said while speaking at a meet-the-press programme here earlier in the day.
"I came to know that the Centre has taken a serious view of the incident. The Home Secretary has sought information from the Delhi Police Commissioner and Kerala House Resident Commissioner," Chandy said.
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He said Delhi police's explanation that they only did their duty and carried out an inspection in accordance with law was not acceptable to the state.
Chandy said BJP's "communal agenda" would not succeed in Kerala, as "securalism is embedded in people in the state."
Slamming the "raid", Chandy had on October 27 shot off a letter to Modi terming the episode "highly objectionable".