The National Human Rights Commission took cognisance of the violence and issued notices to chief secretary and the director general of police, calling for detailed reports in two weeks.
Kerala Chief Minister Pinarayi Vijayan directed the police to conduct a "robust" probe Following the incident at the Asianet News office.
This is perhaps for the first time the CBI raided a serving police chief of a state.
Several youths made an unsuccessful bid to tame bulls released on the roads by miscreants.
Seven CRPF men were killed on Wednesday and their weapons looted after Naxals carried out a deadly landmine blast on their vehicle in the jungles of the worst Naxal-affected Dantewada district of Chhattisgarh.
The home minister said he was deeply pained at the loss of precious lives during the agitation at Tuticorin.
Dharmapuri district Child Welfare Officer J Raja Meenakshi has filed a complaint with the Chennai city police alleging that the minister demanded Rs 20 lakh to transfer her to Chennai.
The Republic Day celebration was about India's Constitution, but the protests also argued for protecting the values of equality and secularism enshrined in it.
The threat to Sasikala won't come from the Tamil Nadu chief minister or New Delhi, but from her 20-plus kin, reports R Rajagopalan.
'It was only relatively recently that Subhash Kapoor was able to secure the sources in India, Afghanistan and Cambodia, that allowed him to get the really highest level objects, and that helped propel him in recent years up the ranks.'