The CBI has filed a fresh case against Lok Sabha MP Karti Chidambaram, son of former finance minister P Chidambaram, for allegedly facilitating visa of 250 Chinese nationals after receiving illegal gratification of Rs 50 lakh, officials said.
The CBI started coordinated search operations at nine locations in multiple cities in the country, including Karti Chidambaram's residence in Chennai, they said.

The searches are being conducted at three locations in Chennai, three in Mumbai, one each in Karnataka, Punjab and Odisha, they added. "I have lost count, how many times has it been? Must be a record," Karti tweeted without specifying.