Paris firefighters say a section of the city's main science museum is ablaze and two firefighters have suffered injuries fighting the flames.

Commander Gabriel Plus told The Associated Press on Thursday morning that the fire broke out in a section of the Cite des Sciences in northeast Paris that is under construction. He said the adjacent exhibit halls and the museum's IMax movie theatre have not caught fire but there remains a risk that it could spread.

The fire broke out overnight in the museum, which houses interactive children's exhibits as well as exhibits on space, light, geology and other subjects. The cause is unclear.