An explosion and fire at Reactor 4 of the Chernobyl Nuclear Power Plant near Pripyat released large amounts of radioactive material across the USSR and Europe.
The accident became the worst civilian nuclear catastrophe in history, forcing the Reagan administration to monitor fallout, assess public-health and environmental risks, and intensify scrutiny of Soviet transparency and nuclear safety amid Cold War tensions.
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A gunman was killed after opening fire near the White House, prompting a security response.
A gunman was shot and killed by Secret Service agents after opening fire near the White House.
The White House was placed on lockdown following reports of gunfire in the vicinity.
FEMA announced preliminary Public Assistance grants and individual aid eligibility for multiple Midwestern states following the President's federal disaster declaration for spring flooding.