An ambulance carrying Minnesota Vikings football player Percy Harvin leaves the Vikings training facility in Eden Prairie, Minn., after Harvin collapsed on the field during a drill at NFL football training camp, Thursday, Aug.19, 2010. Vikings coach Brad Childress said Harvin suffered a migraine headache attack. (AP Photo/St. Paul Pioneer Press, Chris Polydoroff)
Read the article: Ambulance takes away Vikings' Harvin after migraine attack at practice
