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Minnesota Vikings running back Adrian Peterson (28) is tackled by Baltimore Ravens inside linebackers Jameel McClain, left, and Daryl Smith as he rushes the ball in the first half of an NFL football game, Sunday, Dec. 8, 2013, in Baltimore

Minnesota Vikings running back Adrian Peterson (28) is tackled by Baltimore Ravens inside linebackers Jameel McClain, left, and Daryl Smith as he rushes the ball in the first half of an NFL football game, Sunday, Dec. 8, 2013, in Baltimore. (AP Photo/Nick Wass)

Vikings RB Peterson leaves with ankle injury

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Minnesota Vikings running back Adrian Peterson went down Sunday with an apparent ankle injury against the Baltimore Ravens and was carted off the field.

The injury happened early in the second quarter, when Peterson caught a swing pass from Matt Cassel in the flat. After Peterson was tackled near the sideline by Ravens rookie linebacker Arthur Brown, Peterson fumbled the ball out of bounds and immediately fell to the snowy ground in writhing pain.