The Bills declined to give details on Fred Jackson's groin injury following Sunday's win over the Vikings.
Advice: All coach Doug Marrone said is that Jackson is headed for further testing, presumably an MRI. But given that he had to be carted off and appeared to be crying, it has the look of a serious injury. C.J. Spiller broke his collarbone Sunday, leaving Bryce Brown and Anthony Dixon as the Bills' top-two backs
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