Details of the $13.5 billion loan and bond financing backing U.S. private equity firm Blackstone Group’s (BX.N) acquisition of a majority stake in Thomson Reuters’ Financial and Risk (F&R) unit (TRI.TO) are emerging, banking sources said on Thursday.

The deal is being led by JP Morgan, Bank of America Merrill Lynch and Citigroup. More than 20 banks were invited to join at the next level to underwrite 28 percent of the deal, the sources said.

Blackstone is seeking credit approval by Friday, they said, adding that there could be six to seven tiers of commitments. Blackstone declined to comment.

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