Four people are in critical condition following an apparent lightning strike at a Washington, D.C., park, authorities said Thursday evening.

Please you fire and EMS received the call for report of a lightning
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4 critically injured after apparent lightning incident in DC: Official
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D.C. Fire and EMS said it had responded to Lafayette Park, located in front of the White House, and was treating the four patients that were found in "the vicinity of a tree."

Two men and two women were transported to area hospitals with "life-threatening injuries" after the apparent lightning strike, D.C. Fire and EMS said.

Officials said it's still unclear what the adults were doing prior to the lightning strike, if they knew each other and why they were in the park. The identity of the victims could not be confirmed while the investigation is still ongoing, officials said.

In this photo posted to the DC Fire and EMS Twitter account, first responders work at the scene of a lightning strike in Washington, D.C., on Aug. 4, 2022.
© DC Fire and EMS/TwitterIn this photo posted to the DC Fire and EMS Twitter account, first responders work at the scene of a lightning strike in Washington, D.C., on Aug. 4, 2022.

Uniformed U.S. Park Police officers and members of the Secret Service were also on the scene and immediately rendered aid to the victims, an EMS official said during a news conference.

In this photo posted to the DC Fire and EMS Twitter account, first responders work at the scene of a lightning strike in Washington, D.C., on Aug. 4, 2022.
© DC Fire and EMS/TwitterIn this photo posted to the DC Fire and EMS Twitter account, first responders work at the scene of a lightning strike in Washington, D.C., on Aug. 4, 2022.

The National Weather Service had issued a severe thunderstorm warning for the area Thursday evening.

ABC News' Beatrice Peterson contributed to this report.