It concerns 76-year-old James Mueller and his 75-year-old wife Donna Mueller from the state of Wisconsin. The other victim is a 29-year-old man. The fourth person, a woman, is still in critical condition in hospital.

    The four adults were found around 7 p.m. (local time) in Lafayette Square park next to the White House, a few dozen yards from the statue of former President Andrew Jackson. What exactly happened is still under investigation by authorities. It is unclear why the people were in the park. A severe thunderstorm warning was issued in Washington on Thursday evening.