James Mueller, 76, and Donna Mueller, 74, died from injuries sustained in Lafayette Park, the plaza in front of the White House, a Metropolitan Police spokesman said Friday.
The couple were tourists from Wisconsin and, along with two other people whose identities were not disclosed, sought shelter under a tree when a severe thunderstorm hit the Washington metropolitan area at dusk.
The four people were found in a wooded area near the equestrian statue of former U.S. President Andrew Jackson. Before the arrival of emergency services, they were assisted by the Park Police and the Secret Service who are in charge of protecting the presidential residence.
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Firefighters had reported that two men and two women had been taken to nearby hospitals in critical condition.