People in Europe are observing a phenomenon in the sky.
Tons of reports on social media following a spiral smoke observed in the skies of Europe.
Reports from France, UK, Belgium are showing the same blue phenomenon at around 20:00 UTC.
This actually follow the lunch of a US classified mission (NORL-69) by a Space X Falcon 9 rocket.
The National Reconnaissance Office (NRO), in partnership with U.S. Space Force Space Systems Command (SSC), Space Launch Delta 45, and SpaceX, successfully launched the NROL-69 mission aboard a SpaceX Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Space Force Station on March 24, 2025, at 1:48 p.m. EDT.
The Falcon 9 reusable rocket booster returned safely to Landing Zone 1 after delivering the national security payload to orbit.

What was seen in the sky of Europe was actually the dump fuel during second revolution of the rocket’s upper stage.