Public health officials say a total of 264 people were injured in last week's bomb attack at the Boston Marathon.
Authorities have revised the number of injured several times over the past week as additional cases proved to be linked to the April 15 explosions.
Nick Martin, a spokesman for the the Boston Public Health Commission, said the latest count includes patients who may not have sought medical help at the scene but later checked into hospitals.
"There are people that, I think, felt like they had minor injuries right after and they realized their symptoms weren't going away," Martin said.
Twenty-six hospitals in the Boston area have treated Marathon bombing victims.
About 48 people remained hospitalized as of Monday, according to medical officials.
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