Bumi had launched a probe into PT Bumi Resources in which it owns a 29% stake.
Morgan had already helped Bumi Resources issue bonds and advised Berau on a Jakarta listing.
An area of focus of the investigation will be the development funds of PT Bumi Resources Tbk.
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Bakrie was said to be seeking a public bailout for its Bumi Resources via a state-owned coal company.
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In Indonesia, miner PT Bayan Resources jumped 9.1% and shares of Asia's biggest thermal coal exporter, Bumi Resources, rose as much as 5.6%.
Mr. Rothschild subsequently claimed to have been passed information by a whistle-blower that he said showed evidence of financial irregularities at Bumi Resources.
Allegations of financial irregularities at its key Indonesian operating subsidiary, PT Bumi Resources - in which it owns 29% alongside the Bakrie family - first emerged in September, after Mr Rothschild received information from a whistleblower.
Bumi said that it received a request from the Bakrie Group to cancel their indirect 23.8% shareholding, in exchange for an equivalent value of PT Bumi Resources shares representing 10.3% of the total outstanding share capital.
Allegations of financial irregularities at Bumi's key Indonesian operating subsidiary, PT Bumi Resources - in which it owns 29% alongside the Bakrie family - first emerged that month, after Mr Rothschild received information from a whistleblower.
Relations between the two turned sour late last year after Mr Rothschild called for a radical clean-up at PT Bumi Resources, one of the firms owned by the Bakrie family, in which Bumi holds a 29% stake.
The Bakries, backed by the independent non-executive directors, have offered to buy back Bumi Resources, leaving Bumi PLC with the Berau coal-mining assets in a deal that would leave shareholders with a loss of about 50% on their original investment.
At the same time, Mr. Rothschild publicly accused Bumi PLC's locally-listed affiliate Bumi Resources of failing to clean up its balance sheet, including calling in loans to related parties that he argued fell short of U.K. governance rules but which Bumi Resources said had been disclosed in due diligence.
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