Two gunmen opened fire inside Union Station, Missouri, at the event attended by a million NFL fans shortly after 3.30pm on Wednesday. Figures of those wounded rose from nine to 14 then as many as 22 since the outrage, with people seen wheeled away from the chaos on stretchers by medics.
Three victims understood to have been left in critical condition, five are in a serious condition and one had non-life-threatening injuries. Officers say they have detained two armed people and another person for further investigation and one man in a red hoodie was seen being led away in handcuffs.