29-year-old man is the third person to die after a lightning strike in front of the White House

Police confirmed to ABC News on Friday that two Wisconsin residents celebrating their wedding anniversary were killed in a lightning strike near the White House on Thursday night.

According to police, a third victim, a 29-year-old man, died in the incident on Friday afternoon. According to police, a fourth person is still in critical condition as a result of the lightning strike.

James Mueller, 76, and Donna Mueller, 75, both of Janesville, Wisconsin, died after being injured in the strike in Lafayette Park in front of the White House, according to police.

The Muellers were married, according to Metropolitan Police Department Chief Robert Contee, and they were in Washington to celebrate their 56th wedding anniversary, according to Madison.com.

The third victim’s identity is being withheld pending notification of family.

D.C. Fire and EMS said Thursday night that they had responded and were treating four patients found in “the vicinity of a tree.”

According to the report, the two men and two women were taken to area hospitals with “life-threatening injuries.”

Officials say they do not know what the adults were doing before the lightning strike or why they were in the park.

White House press secretary Karine Jean-Pierre expressed sadness Friday morning following word the two Wisconsin residents had died.

“We are saddened by the tragic loss of life after the lightning strike in Lafayette Park. Our hearts are with the families who lost loved ones, and we are praying for those still fighting for their lives,” she said in a brief statement.

An EMS official said during a news conference that uniformed US Park Police officers and Secret Service agents were also on the scene and immediately rendered aid to the victims.

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