A total solar eclipse is plunging the skies along a swathe of North America into darkness.
The moon will completely block out the sun for more than four minutes in some places along a path starting in Mexico and crossing through the United States and into Canada.
Millions are hoping for clouds to clear as they eagerly wait for the phenomenon to reach their location.
Almost everyone on the continent is guaranteed to see at least a partial eclipse – weather permitting.
Follow live:
Total eclipse begins as millions of stargazers wait to be plunged into darkness
A total solar eclipse is seen from Mazatlan in Mexico
Pic: Reuters
Pic Nasa TV
People dance next to models of the earth, sun and moon at Saluki Stadium in Illinois.
Pic: Reuters
Tawhid Rana holds his daughter Thia, as she views the sun at the Indianapolis Motor Speedway. Pic: AP
A rainbow forms over Niagara Falls as people wait for a solar eclipse. Pic: Reuters
Clouds pass in front of the sun in Eagle Pass.
Pic: Texas Houston Chronicle/AP
Ximena 7 and Magdalena Govea 11 wait at the Saluki Stadium in Illinois.
Pic: Reuters
People prepare their telescopes in Mazatlan, Mexico.
Pic: Reuters
Pic: Reuters
Some of the 309 people gathered to break the Guinness World Record for the largest group of people dressed as the sun in Niagara Falls, Ontario, Canada.
Pic: Reuters
Passengers wear solar eclipse glasses as they get ready to board a plane en route to Detroit, Michigan.
Pic: Reuters
People stand next to bubbles as they assemble to view a total solar eclipse in Eagle Pass, Texas.
Pic: Reuters
The observation deck of Edge at Hudson Yards in New York.
Pic: Reuters
Fabian Rodriguez in Eagle Pass, Texas.
Pic: Reuters
Tourists sit by the Horseshoe Falls ahead of the Solar Eclipse. Pic: Reuters
Path of the eclipse (UK timings)
Tamra Sylvester poses with a person dressed as a NASA astronaut during a total eclipse viewing event at the Indianapolis Motor Speedway.
Pic: AP
Special protective glasses placed for people to observe the solar eclipse, in Torreon. Mexico.
Pic: Reuters
Amateur astronomers prepare to watch a total solar eclipse in Mazatlan, Mexico.
Pic: AP
A map showing parts of the UK that will be able to see a partial eclipse
Read more:
What can I see in the UK and when?
Experts debunk eclipse claims from conspiracy theorists
What are scientists hoping to learn from eclipse
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