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Pfizer and BioNTech announced Thursday that a booster shot of its coronavirus vaccine was 95.6% effective at preventing symptomatic cases of COVID-19 in a Phase 3 clinical trial.

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Nikolas Cruz pleaded guilty Wednesday to first-degree murder and attempted murder charges in the 2018 massacre at Marjory Stoneman Douglas High School in Parkland.

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Michael Hetle, 54, of Springfield, Virginia, was convicted Thursday of first-degree murder in the March 3, 2020, death of 24-year-old Javon Malik Prather. The deadly shooting and its aftermath were captured on Hetle's doorbell camera.

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A U.S. Naval engineer and his wife have been charged with repeatedly trying to pass secrets about U.S. nuclear submarines to a foreign country,.

A woman seen in viral video berating and striking a Navy sailor on the 20th anniversary of the Sept. 11 terror attacks turned herself in Thursday to face charges in the incident, police said.

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Defense Department officials announced Tuesday that Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs of Staff Army Gen. Mark Milley will host a ceremony Saturday to remember those killed in the 2001 terrorist attack on the Pentagon.

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The Centers for Disease Control and Prevention are asking unvaccinated Americans to stay home this Labor Day and not travel.

The latest figures mark the third consecutive seven-day period during which 1 million new COVID-19 cases were reported.

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Ida was downgraded to a tropical depression late Monday afternoon more than 24 hours after making landfall as a Category 4 hurricane in Louisiana, according to the National Hurricane Center.

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Mike Richards on Friday stepped down as the next host of “Jeopardy!” after controversial comments he made on a podcast that aired in 2013 and 2014 resurfaced, officials at Sony Pictures Television confirmed.

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The Federal Emergency Management Agency will conduct a national test of its Wireless Emergency Alerts and its Emergency Alert System on Aug. 11, according to agency officials.

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While the dominant strain of the coronavirus in the U.S. is the delta variant, the lambda variation has been identified as a variant of interest by world health officials.

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Kroger is joining a list of retailers updating their mask guidelines as a highly contagious form of the coronavirus continues to rapidly spread.

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Disney employees already are required to be wearing masks at all U.S. sites. Now, they must be vaccinated.

Employees at Florida grocery giant Publix Super Markets will be required to wear face coverings regardless of their COVID-19 status starting Monday.