India's Prime Minister Manmohan Singh has told David Cameron he has "very serious concerns about unethical means" used to secure a deal between Anglo-Italian helicopter firm AgustaWestland and the Indian air force.
Mr Cameron has said that the UK will respond to any requests for information, and that he is glad that Italian authorities are investigating the matter.
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The pair, believed to be the boy's mother and stepfather, were held after the five-year-old's lifeless body was discovered in a lagoon.