After Russian President Vladimir Putin declared a "special military operation" in Ukraine early Thursday morning, videos and photos surfaced on social media purportedly showing the reality of war in Europe. As the sun rose, sirens sounded near Kyiv as the Ukrainian president declared martial law across the country.

An error occurred while retrieving the Tweet. It might have been deleted.

Sirens were also heard in the country's second largest city of Lviv.

An error occurred while retrieving the Tweet. It might have been deleted.

Fox News correspondents in Ukraine heard multiple explosions as dawn broke in Kyiv, the capital city of nearly 3 million people.

Videos of purported explosions within Ukraine circulated on social media. Fox News has not independently confirmed the authenticity of each of these videos.

An error occurred while retrieving the Tweet. It might have been deleted.

PUTIN DECLARES ‘SPECIAL MILITARY OPERATION’ IN UKRAINE: LIVE UPDATES

An error occurred while retrieving the Tweet. It might have been deleted.

For continuing coverage of the Ukraine crisis, stay with Fox News for live updates.