WASHINGTON — Wachovia Corp. is expected to be fined $100 million to $200 million this week over its failure to detect suspicious activity on certain Mexican money transfer business accounts.

The fine, which could come as early as Wednesday, involves Wachovia's business with casas de cambio between 2004 and 2007. Regulators could also require the company to conduct a "lookback" of past activity to determine if additional suspicious transactions can be identified.

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