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The SNC executives — Pierre Duhaime, former chief executive officer, and Riadh Ben Aissa, former head of its global construction business — were charged last fall with fraud and using forged documents in connection with the hospital contract. They now face a raft of additional charges tied to the alleged conspiracy with Dr. Porter and Mr. Elbaz.

A fifth person, Jeremy Morris, also of the Bahamas, is named in the warrant as having taken part in the alleged conspiracy. The Globe & Mail has reported he is listed as a principal in Sierra Asset Management Inc., a shadowy finance firm that was incorporated in the Bahamas in November 2009, just as the bidding process for the hospital project was coming to a close.

An affidavit used to obtain a warrant to search the MUHC headquarters last September — unsealed last week at the request of the National Post and other media — revealed two unnamed MUHC administrators were suspected of fraud over the superhospital construction contract.

The affidavit alleged Mr. Ben Aissa oversaw the transfer of $22.5-million from SNC-Lavalin’s Tunisian operation to a bank account in the name of Sierra Asset Management. External auditors called in by SNC-Lavalin to examine the transaction were unable to establish what, if any, services were performed in exchange for the payment.

The 24 counts announced Wednesday include fraud, fraud against the government, breach of trust, conspiracy and laundering the proceeds of crime.