US officials restricted the airspace over Lake Michigan on Sunday citing a potential new threat to national security but soon reopened the skies, as the United States and Canada respond to multiple air intrusions.
The Federal Aviation Administration (FAA) announced "temporary flight restrictions" over one of the Great Lakes along the US-Canada border, designating it as "national defense airspace," one day after a similar closure over Montana led to the scrambling of US fighter jets.
The Montana closure was ordered over a "radar anomaly," but no object was discovered.
Similarly, the Lake Michigan restrictions were lifted shortly after they were announced, apparently with no threat detected.
"The FAA briefly closed some airspace over Lake Michigan to support Department of Defense activities. The airspace has been reopened," the agency said in a statement to AFP.
Sunday's action over Lake Michigan marked the latest move to address a series of potential national security threats that began in late January with the discovery of a Chinese balloon -- dubbed a spy craft by US officials -- traversing the United States at high altitude.
It was eventually shot down February 4 by an F-22 jet off the South Carolina coast.
China insisted the balloon was conducting weather research, but the Pentagon said the object, parts of which have already been recovered from the water, was capable of conducting surveillance.
Last Friday US fighter jets downed another object off northern Alaska, the military said, adding it was "within US sovereign airspace over US territorial water." It lacked any system of propulsion or control, officials said.
And on Saturday a US F-22, acting on US and Canadian orders, shot down a mysterious, cylindrical "airborne object" over Canada's Yukon territory about 100 miles (160 kilometers) from the US border, saying it posed a threat to civilian flight.
Calls have grown meanwhile for President Joe Biden to provide a detailed account to the American people of the nature of the objects, the potential threats to the homeland, and what Washington has planned to prevent more such missions.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
Featured Video Of The Day
KTR Offers "Unconditional Apology" For His Remarks On Women
US Shuts Airspace Over Lake Michigan, Cites "National Defense" China Spots Unknown Object Over Its Waters, To Shoot It Down: Report US Jet Shoots Down "Unidentified Object" Over Canada, 2nd Strike In 2 Days Parents Gave Names Of Interns, Doctors To CBI In Kolkata Horror: Sources Video: Woman Tries To Jump Off Mumbai's Atal Setu, Saved By Driver, Cops How Extreme Weather Is Leading To Rise In Child Marriages In Pakistan "Shoot Me Up With...": What Matthew Perry Told Assistant Hours Before Death Private Jets, Luxury Cars: Lavish Life Of "Ketamine Queen" Jasveen Sangha Kerala Launches 1st Digital Court For Negotiable Instruments Cases Track Latest News Live on NDTV.com and get news updates from India and around the world.