In a press briefing, Air Force General Glen VanHerck, who safeguards United States airspace as head of North American Aerospace Defence Command (NORAD) and Northern Command, said, "We're calling them objects, not balloons, for a reason."
The coldest blast of arctic air has swept across some of United State's biggest cities. Schools were shut, public transport hit and office-goers delayed across the Midwest and New England because of below-zero temperatures.
United States President Barack Obama got emotional as he thanked staff at his campaign headquarters.
Temperatures have plunged to -30 degree Celsius (-22F) and below in parts of North America as extreme cold weather known as a polar vortex strikes the region. At least eight people are reported to have died in incidents related to the weather.
Temperatures dipped as low as -19 degree Fahrenheit (-28 degree Celsisus) -- breaking the city's previous cold weather record for that day set in 1966.
A blast of Arctic air from the polar vortex has brought dangerous, bone-chilling cold to a wide swath of the United States on Tuesday, stretching from the Dakotas through Maine, with snow expected as far south as Alabama and Georgia. Arctic air and icy conditions led schools to close, flights to be cancelled and railway officials to set fires on train tracks to prevent them from cracking.
Temperatures are dropping across the United States, which is bracing for one of the coldest Januarys it has seen in quite some time.
In a bizarre case, a foul-mouthed parrot may provide key evidence in the murder trial of a woman accused of killing her husband in the United States.
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These images from across the globe tell that it is a crazy world out there!
The women's World Cup final between the United States and Japan on Sunday may not rival the Super Bowl, but soccer fans, wild with excitement.
At least 200 Indian students stranded at the University of Houston were being evacuated to safer places.
Some of the best photographs, clicked across the globe in January.
Here are some of the best iPhone photos taken this year.
'Prashant has left us and it is really tragic. But I want to hold on to those little moments of happiness that he shared with me and with others whose lives he touched. That is how I want to remember him.' Aseem Chhabra pays tribute to Patang director Prashant Bhargava, who passed away on May 16. He was only 42.