At Beth Israel Deaconess Medical Center, Dr. Stephen Epstein, attending physician in the emergency department, said X-rays of patients showed metal balls that appeared to be ball bearings.
Dr. Stephen Epstein, attending physician in the emergency department at Beth Israel Deaconess Medical Center in Boston, said the hospital had received at least 21 patients from the explosions Monday, ranging from people complaining of ear damage to seven needing surgery for life-threatening injuries.