Russian Soyuz rocket stage's uncontrolled destruction in the atmosphere was observed over the Mediterranean region early Sunday morning.
The re-entry could be seen in the French Riviera, Tuscany and Southern Italy at 04:30 Moscow time.
Some eyewitnesses reportedly confessed that they mistakenly took the rocket for the Chinese station Tiangong-1, which is expected to fall to Earth in early April 2018.
A previous report from the China National Space Administration in 2016 revealed that the Tiangong-1 would be unable to perform a controlled reentry.
The Soyuz-FG carrier rocket that delivered a three-man crew to the International Space Station earlier this week was launched from the Baikonur cosmodrome on March 21, 2018.