Police had rescued British nationals Thavaraja (59) and his wife Salaja (55) from a house at Mandarakuppam in Tamil Nadu's Cuddalore district on June 1 and arrested Dharmalingam, Indra Antonysamy, Prabhu, Saravanan, Satheeshkumar, Vasanth, Mathiazahagan and Ilango for allegedly kidnapping them, a police release said.
Based on a complaint on May 29 that the couple, who landed at the airport here from Colombo, were missing, a case was registered, which led to their rescue. They were originally from Sri Lanka and had settled down in the UK and obtained citizenship.
The couple had arrived here to proceed to Tiruchirapalli, where they planned to join a tour operator and visit temples in the state for nine days.
Investigations revealed that the couple's daughter Dharshini, residing in London, received calls from unidentified men who claimed to have abducted her parents and sought a ransom of Rs 2.58 crore (UK pound 300,000).
Some persons were arrested by the Metropolitan Police at London in connection with the case.