English translation (quickly done)
PARIS (Reuters) - A big explosion, pobably due to gaz, happened Wednesday in the middle of the day in a 19th century building, 8 rue d'Uzes, resulting in a dozen of wounded people, one of those heavily wounded, declared the firemen
The police said the explosion was probably due to the gaz. "This is not a terrorist attack, we are not investigating that way" they said.
The explosion happened at 11h52 on the 4th and 5th floor of the building.
140 men have been sent to take care of it, with an enhanced medical center