NEW YORK (CNNMoney) -- Preliminary reports for Black Friday indicate that retailers may have seen their strongest sales ever during the all-important kick-off to the holiday shopping season.

Retail sales on Black Friday climbed 6.6% this year to an estimated $11.4 billion, according to ShopperTrak, which tracks foot traffic at malls and stores. Last year, sales climbed just 0.3% to $10.7 billion, which was a record one-day sales amount at the time, according to the company.

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