Under Armour tanks 16% after reporting a 2-year probe into its accounting and lowering its sales forecast

Under Armour's shares plummeted on Monday after the company said that it has been investigated by federal authorities over its accounting practices.
The company also lowered its full-year sales forecast.
The sportswear company saw shares drop 16% in early trading.
The company said last month that CEO Kevin Plank will step down on January 1. 
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Under Armour's shares are tanking after saying officials had been investigating its accounting pract