Texas police accuse the estranged wife of internationally renowned pianist Vadym Kholodenko of killing the couple's two young daughters before stabbing herself.

Nancy Reagan, the former actress who was fiercely protective of husband Ronald Reagan through a Hollywood career, eight years in the White House, an assassination attempt and Alzheimer's disease, dies at age 94, the Reagan library says.

A man working as an Uber driver admits to the fatal weekend shootings of six people in Kalamazoo, Michigan, a police detective testifies in a case raising questions about how the car service vets its drivers.

A man arrested on suspicion of shooting dead six people in the northern US state of Michigan is an Uber driver who may have picked up fares during the killing spree.

Six people are shot and killed and several others wounded in Michigan, US in a series of apparently random shootings, authorities say.

US scientists have modelled how a 1930s-like "dustbowl" drought might impact American agriculture today, and found it to be just as damaging.

The Pentagon releases nearly 200 photographs linked to allegations of abuse by the US military in Iraq and Afghanistan over a decade ago.

Twitter says it has suspended more than 125,000 accounts since mid-2015 "for threatening or promoting terrorist acts".

Private individuals will no longer be allowed to advertise guns on Facebook and Instagram, the photo-sharing service owned by Facebook.

For her lengthy list of achievements in science, a Cuban-American woman is speculated to be the next Albert Einstein, reports Vibe.

A near record blizzard smothers the eastern United States, shutting down New York and Washington in a colossal storm that leaves 15 people dead and affects some 85 million residents.

Maintenance errors by three airmen damaged a nuclear-armed missile in its silo in 2014, the US Air Force says.

A monster blizzard threatening the US East Coast slams into Washington, blanketing the nation's capital in snow as officials urged millions in the storm's path to seek shelter, warning the worst was yet to come.

Shots ring out at a school in western Canada, leaving four people dead and several others critically injured in the nation's worst such shooting in a quarter of a century. "Obviously, this is every parent's worst nightmare," said Prime Minster Justin Trudeau.