In a communication, the Home Ministry told the state government to give a detailed report about the incident and send it as early as possible, official sources said.
Andhra Pradesh Chief Minister N Chandrababu Naidu has briefed Home Minister Rajnath Singh about the incident and the action taken by the state government in this regard.
During their telephonic conversation last night, Naidu explained to the Home Minister the circumstances leading to the killing of the 20 red sanders "smugglers" by Andhra Pradesh Police, official sources said today.
Tamil Nadu Chief Minister O P Panneerselvam has already shot off a strongly-worded letter to Naidu demanding a "credible and speedy" inquiry into the episode and fixing of responsibility for possible human rights violations.
20 people were gunned down in Andhra Pradesh's Chittoor district in a police operation said to be against red sanders smugglers, that came under severe attack from the government and political parties in Tamil Nadu which claimed 12 of the victims were labourers from their state.