Three people have been injured in a huge explosion at one of the University of Lyon's campuses in France, Trend reports referring to Mirror.
Loud bangs echoed across the city and flames and thick black smoke can be seen billowing from the Mendel building on the La Doua campus in Villeurbanne.
The fire started in the roof of the building, which was being renovated, before gas cylinders stored there exploded.
Several explosions were heard just before 9am (8am UK time) and captured on camera. At least three have been hurt, according to the university.
People are being urged to avoid the area while many are being evacuated, although the university has since said the fire is "under control."
The University tweeted: "Ongoing fire on the Mendel building (LyonTech-La Doua campus). Safety instructions: stay away at least 100m from the building.
"Fire Department-Firefighters and police are on site, thank you for keeping the perimeter safe and letting them do their job."
They later added: "Fire underway on the roof terrace of the Mendel building due to the rehabilitation work. Buildings + BU evacuated.
"Security perimeter installed. The explosions heard came from the works. No chemical safety problems."
The LyonTech-la Doua Campus has 22,000 students and is home to the Faculty of Science and Technology.
"The explosions happened inside the Science Library shortly after 9am," said a spokesman for the local prefecture.
"Sealing work was in progress on the roof the building, and this is how the fire started. An evacuation is underway."
Speaking just before 11am local time, the spokesman added: "An accidental fire was declared on the roof of a laboratory on the campus of La Doua due @UnivLyon1 to sealing work.
"Detonation was heard due to the presence of 3 gas cylinders. Three light casualties."