While the reasons for his resignation are yet unclear, Rupani becomes the third BJP chief minister to step down in the recent past.
A probe will be conducted by a retired judge into the lathi-charge on August 28 and will also ascertain the role of IAS officer Ayush Sinha, who asked the police to 'break the heads' of farmers.
The bench was hearing a PIL filed by Lok Sabha MP from Madurai, Su Venkatesan, who approached the HC after he received a reply from the Centre in Hindi to a representation made by him in English.
The same video was also used by Times Now Navbharat and Zee Hindustan.
Cairn will drop cases to seize diplomatic apartments in Paris and Air India airplanes in the US in 'a matter of a couple of days' after the refund, said Cairn CEO Simon Thomson.