NEW YORK - CITIGROUP Inc will acquire the banking operations of Wachovia Corp, one of the largest US banks, in a deal facilitated by the government agency that insures the country's bank deposits.

Citigroup also will grant the FDIC $12 billion in preferred stock and warrants.

The FDIC asserted that Wachovia didn't fail, and that all depositors are protected and there will be no cost to the Deposit Insurance Fund.

The sale of Wachovia Corp comes just days after the government's seizure of Seattle-based Washington Mutual Inc - the largest bank failure in US history.

Even as details of its takeover unfolded, Wachovia shares plunged 87 per cent in Monday premarket trading to $1.36. The stock had closed on Friday at $10, down 74 per cent for the year.

Wachovia has been among the banks hardest hit by the ongoing crisis in the mortgage market. Its current problems stem largely from its acquisition of mortgage lender Golden West Financial Corp in 2006 for roughly $25 billion at the height of the nation's housing boom.

With that purchase, Wachovia inherited a deteriorating $122 billion portfolio of Pick-A-Payment loans, Golden West's specialty, which let borrowers skip some payments.

This weekend Citigroup was reportedly in competition with Wells Fargo and Spain's Banco Santander for the struggling bank.

Banco Santander declined to comment early on Monday and Wells Fargo spokesmen could not be immediately reached for comment. -- AP