India's opposition Congress party has accused the government of pursuing a "vendetta" against P Chidambaram, the former finance minister, after Mr Chidambaram's son was arrested in connection with accusations he broke the country's strict foreign investment rules.

Agents from the Central Bureau of Investigation arrested Karti Chidambaram on Wednesday morning as he arrived in the southern city of Chennai, officials told local reporters. They have been investigating him over a deal approved by his father when his father was the finance minister.

Congress on Wednesday accused the governing Bharatiya Janata party of pushing a political agenda as India begins to look to its next general election, which is due to take place by next May.

Subramanian Swamy, a prominent BJP politician, has frequently attacked both P Chidambaram and his son, and tweeted on Wednesday morning: "The CBI now headed by Alok Verma has lived up to his reputation of being independent."

Randeep Surjewala, a Congress spokesman, said however that his party "would not be deterred" from continuing to "bring out the truth".

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